LED strips, neon flex and flexible wall washers can all create long lines of light, but they are not interchangeable products.

Their fundamental jobs are different:

• LED strip generates flexible linear light for profiles, coves, cabinets and concealed details.
• Neon flex creates a continuous luminous line intended to be seen directly.
• Flexible wall washer uses optical lenses to project and distribute light across a wall or façade.

The most common selection mistake is choosing by physical appearance instead of asking where the light needs to go.

A flexible product that glows brightly when viewed from one meter away may fail to illuminate the upper part of a four-meter wall. A powerful wall washer may illuminate that wall effectively but look uncomfortable when used as an exposed decorative line.

Start with the required lighting effect, then select the product.

Quick Answer

Choose an LED strip when you need:

• Cove lighting
• Cabinet or shelf lighting
• Indirect architectural light
• Small installation dimensions
• Short cutting intervals
• High luminous efficacy
• Flexible selection of profiles and diffusers
• Tunable white, RGBW or addressable control

Choose neon flex when you need:

• A visible continuous line of light
• Building outlines
• Signage
• Curved decorative shapes
• Dotless direct-view illumination
• Silicone or polyurethane protection
• Vertical, horizontal, 3D or 360-degree bending options

Choose a flexible wall washer when you need:

• Light projected up a wall
• Façade washing
• Wall grazing
• Controlled narrow or asymmetric beams
• Curved-wall illumination
• Higher directional intensity
• Optical control over spill and glare

The decision can be reduced to one question:

Should the viewer see the light source, see the glow around it or see a distant surface illuminated by it?

Three Products, Three Different Optical Functions

LED Strip: A Flexible Light Engine

An LED strip is a flexible PCB carrying LEDs and electrical components.

It may be:

• Bare
• Coated
• Waterproofed
• Installed inside an aluminum profile
• Combined with a diffuser
• Hidden inside a cove
• Integrated into furniture

The strip itself is normally a component rather than a complete architectural luminaire.

Its final performance depends on:

• LED package
• LED density
• PCB construction
• Watts per meter
• Aluminum profile
• Diffuser
• Driver
• Controller
• Mounting surface
• Viewing distance

A conventional SMD strip may show individual LED points. A high-density SMD or COB strip can create a smoother line, particularly when matched with the correct LED aluminum profile.

Best Uses for LED Strip

• Ceiling coves
• Under-cabinet lighting
• Shelf lighting
• Furniture
• Display cases
• Mirror backlighting
• Stair details
• Recessed architectural lines
• Backlit panels
• Interior accent lighting

Neon Flex: A Flexible Luminous Object

LED neon flex places an internal LED light engine inside an extruded silicone, polyurethane or PVC optical body.

The material performs several functions:

• Diffuses the LEDs
• Forms the visible emitting surface
• Protects the internal circuit
• Defines the bend direction
• Provides a mounting shape
• Controls part of the environmental protection

Unlike a bare strip, neon flex is normally selected because the luminous line itself will be visible.

Best Uses for Neon Flex

• Building outlines
• Decorative contours
• Logos
• Letters
• Curved ceilings
• Landscape outlines
• Hospitality details
• Direct-view architectural lines
• Artistic installations
• Poolside or underwater accents using appropriately tested products

Flexible Wall Washer: A Flexible Optical Luminaire

A flexible wall washer contains LEDs, an enclosure and optical lenses designed to control the beam.

Its purpose is not merely to glow. It must deliver light in a defined direction.

Common optical options can include:

• Narrow symmetric beam
• Medium beam
• Wide beam
• Elliptical beam
• Asymmetric beam

The correct lens can push light farther up a wall, spread it horizontally or reduce backward spill.

Best Uses for Flexible Wall Washer

• Building façades
• Curved walls
• Columns
• Bridges
• Landscape walls
• Textured stone
• Architectural waves
• Irregular exterior paths
• Wall washing
• Wall grazing

Side-by-Side Comparison

The Most Important Difference: Lumens vs Candela

LED strip and neon-flex datasheets often emphasize:

• Lumens per meter
• Watts per meter
• Lumens per watt

Those values remain relevant for wall washers, but they are not sufficient.

A wall washer also requires directional intensity data, usually expressed in candela at different angles.

The Illuminating Engineering Society explains that IES photometric files contain luminous-intensity distribution data that lighting software can use to predict project light levels. See the IES guide to photometric files.

Why a Lower-Lumen Wall Washer Can Illuminate a Wall Better

Consider two hypothetical products.

Product A: Broad LED Strip

• 1,500 lm/m
• Broad uncontrolled output
• Large amount of light travels into the room or sky

Product B: Flexible Wall Washer

• 1,200 lm/m
• Narrow asymmetric lens
• Light is directed onto the façade

Product B produces fewer total lumens but may create much higher vertical illuminance on the target wall.

The wall washer is not generating more light. It is using its light more effectively for that particular task.

This is why a product comparison based only on lm/m can select the wrong fixture.

Wall Washing vs Wall Grazing

A flexible wall washer can be used for two different design effects.

Wall Washing

Wall washing aims to create relatively smooth illumination across a vertical surface.

The fixture is normally positioned far enough from the wall for adjacent beams to overlap.

The desired result is usually:

• Even vertical brightness
• Reduced scalloping
• Soft surface appearance
• Controlled top-to-bottom variation
• Fewer hard shadows

Use wall washing for:

• Smooth plaster
• Painted façades
• Gallery walls
• Commercial entrances
• Large uniform surfaces

Wall Grazing

Wall grazing places the light closer to the surface to reveal texture through highlights and shadows.

The desired result is usually:

• Strong material texture
• Dramatic shadows
• Visible relief
• Emphasis on brick, stone or concrete

Use wall grazing for:

• Natural stone
• Brick
• Ribbed concrete
• Timber relief
• Sculptural façades

Wall Grazing Can Reveal Defects

A grazer does not distinguish between intentional texture and poor workmanship.

It can emphasize:

• Uneven joints
• Patches
• Surface waves
• Fastener marks
• Misaligned panels
• Construction defects

Approve the effect with the actual wall material before finalizing the fixture.

Why Ordinary LED Strip Is Not a Wall Washer

A high-output strip may produce enough lumens, but without optics it usually emits light across a broad angle.

At short distance, this can create:

• A bright region near the strip
• Rapidly declining light farther up the wall
• Excessive spill
• Glare
• Poor vertical uniformity

Installing a strip inside an angled aluminum profile changes its orientation but does not necessarily create a controlled wall-washing distribution.

For short decorative surfaces, an angled strip may be sufficient. For tall walls or critical façades, use photometrically tested optics.

Why Neon Flex Is Not a Wall Washer

Neon flex distributes light through a diffusing body to make the emitting line appear smooth.

That diffusion is almost the opposite of what a long-throw wall washer needs.

Neon flex is excellent when the design wants to see:

• The glowing contour
• A continuous line
• A logo or shape
• A low-level halo

It is less effective when the goal is:

• Illuminating the top of a tall wall
• Creating controlled asymmetric distribution
• Minimizing light spill
• Achieving defined vertical uniformity

A very bright neon line at the base of a façade may still leave the upper wall dark.

LED Strip Selection: More Than LED Density

When selecting an LED strip, specify:

• Required lumens per meter
• Maximum watts per meter
• LED efficacy
• CCT
• CRI, R9 or TM-30 where required
• LED density
• LED pitch
• PCB width
• Cut length
• Voltage
• Maximum run per feed
• Profile
• Diffuser
• Installed output
• Viewing distance

SMD vs COB

Choose SMD when the project prioritizes:

• High efficacy
• High output
• Specialized packages
• Addressable or multichannel options
• Broad product selection

Choose COB when the project prioritizes:

• Continuous appearance
• Shallow profiles
• Direct or close viewing
• Reduced visible LED points

COB does not automatically provide higher efficacy or lower temperature. Compare the exact W/m, lm/m, lm/W and thermal data.

Xmart offers COB LED strip configurations with different voltages, PCB widths, CCTs and color modes for profile-based linear lighting.

Neon Flex Selection: Bend Direction Comes First

“Flexible” does not mean the product can bend in every direction.

The internal PCB orientation and silicone profile determine the permitted bend axis.

Top-Bending or Vertical-Bending Neon

Depending on manufacturer terminology, this construction bends in the direction permitted by its vertical profile geometry.

It may be suitable for:

• Arches
• Building sections
• Curves in a vertical plane
• Certain column or façade details

Side-Bending or Horizontal-Bending Neon

This construction bends laterally when viewed from the emitting face.

It may be suitable for:

• Letters
• Logos
• Floor-plan curves
• Landscape paths
• Horizontal architectural outlines

3D-Bending Neon

A 3D construction is designed to accommodate more than one bend direction.

It can help with:

• Complex architectural curves
• Sculptural lines
• Irregular surfaces
• Transitions between planes

Its minimum bend radius and twisting restrictions still apply.

360-Degree Neon

A round neon product emits around most or all of its circumference.

It is appropriate for:

• Suspended luminous lines
• Artistic installations
• Decorative pendants
• Glass-neon-style effects

It is not necessarily the best option for efficiency or precise surface illumination.

Never Twist Neon to Compensate for the Wrong Bend Type

Forcing neon flex against its permitted axis can cause:

• Internal PCB damage
• Solder-joint cracking
• Silicone stress
• Optical distortion
• Loss of IP integrity
• Premature section failure

Specify:

• Bend direction
• Minimum bend radius
• Maximum twist
• Profile size
• Light-emitting surface
• Cable direction

Flexible Wall Washer Selection: Beam Comes First

The lens is one of the most important wall-washer components.

Possible beam categories include:

• 15° narrow beam
• 30° medium beam
• 45° or 60° wide beam
• 10° × 60° elliptical beam
• 20° × 45° asymmetric or elliptical beam

These are examples only. Available distributions depend on the exact product.

Narrow Beam

Advantages:

• Greater directional intensity
• Potentially longer vertical reach
• Less side spill
• Dramatic grazing effects

Risks:

• Sensitive to aiming
• Visible scalloping
• Bright hot spots
• Installation tolerances become critical

Wide Beam

Advantages:

• Broader coverage
• Softer transitions
• Better for shorter surfaces
• Less sensitive in some close-range applications

Risks:

• Reduced throw
• More spill
• Lower intensity at the upper wall
• Potential glare toward viewers

Asymmetric Beam

Advantages:

• Pushes more light toward the wall
• Can improve top-to-bottom coverage
• Reduces wasted backward light
• Useful when the fixture must remain close to the wall

Risks:

• Orientation is critical
• Reversed installation can send light in the wrong direction
• Photometric simulation must use the correct orientation

Beam Angle Is Not Enough

Two products both labeled 30° can have different:

• Peak candela
• Field angle
• Beam shape
• Edge softness
• Secondary spill
• Distribution symmetry

Review:

• Polar intensity diagram
• IES or LDT file
• Isolux diagram
• Peak candela
• Beam and field angles
• Tested output
• Test orientation

Use Photometric Simulation for Wall-Washer Projects

For a large façade, create a lighting calculation using:

• Exact fixture IES file
• Wall height
• Fixture setback
• Fixture orientation
• Surface reflectance
• Mounting height
• Continuous or segmented layout
• Surrounding ambient light
• Maintenance factor

Evaluate:

• Minimum vertical illuminance
• Average vertical illuminance
• Maximum vertical illuminance
• Max-to-min ratio
• Top-to-bottom variation
• Light spill
• Glare
• Upward light

A straight-segment IES file may not fully represent a fixture bent around a tight curve because each section points in a different direction. Model the curved installation as multiple correctly oriented segments when project accuracy matters.

Bending Comparison

Do not approve flexibility from a hand-bent sample alone.

Request:

• Minimum static bend radius
• Minimum dynamic bend radius, if applicable
• Number of permitted bending cycles
• Bending axis diagram
• Prohibited bend directions
• Installation-temperature limits
• Distance from connector to first bend

Size and Visual Integration

LED Strip

Advantages:

• Smallest footprint
• Fits narrow grooves
• Can disappear inside millwork
• Large choice of PCB widths
• Short cut units available

Additional components may include:

• Aluminum profile
• Diffuser
• End cap
• Mounting clip

Neon Flex

Advantages:

• Finished luminous surface
• No separate diffuser in many applications
• Strong daytime visual line
• Available in multiple profile shapes

Trade-offs:

• Larger dimensions
• More visible when switched off
• Minimum bend radius
• More difficult hidden connection
• Heavier than a bare strip

Flexible Wall Washer

Advantages:

• Integrated optical function
• Curved-façade capability
• More compact than some rigid wall washers
• Rollable or sectional transport for certain models

Trade-offs:

• Larger than strip or neon
• Lens orientation must remain accurate
• Mounting alignment is critical
• More visible during the day
• Higher power and weight

Thermal Performance

LED Strip

A bare strip mounted to a suitable aluminum profile can have a relatively direct thermal path.

Thermal performance depends on:

• Watts per meter
• PCB width and copper
• Adhesive contact
• Profile size
• Airflow
• Ambient temperature

Neon Flex

The diffusing silicone or polyurethane body can retain heat.

Do not assume that a lower external surface temperature means the LEDs are cooler. The encapsulation may create a temperature gradient between the internal PCB and outer surface.

Flexible Wall Washer

Wall washers may use higher-power LEDs and optical lenses.

Evaluate temperature at:

• LED reference point
• PCB
• Optical lens
• Regulator
• Cable entry
• End seal
• Mounting surface

The installation channel must preserve both the required bend and the thermal path.

Optical Efficiency and Useful Light

A bare LED strip can achieve high lm/W because little optical material covers the LEDs.

Neon flex loses some light through:

• Diffusing silicone
• Internal reflection
• Absorption
• Multi-sided emission
• Thick optical walls

A wall washer loses some light through lenses and enclosure materials but can deliver more useful light to the intended surface.

This produces an important distinction:

• Bare efficacy: total lumens leaving the product per watt
• Application efficacy: useful light reaching the intended surface per watt

The most efficient product on an integrating-sphere report may not be the most efficient product for a façade.

Outdoor and Waterproof Selection

All three product types can be manufactured with outdoor protection, but their sealing methods differ.

Waterproof LED Strip

Critical areas:

• Cut pads
• Coating coverage
• End seals
• Cable entries
• Connectors
• Adhesive
• Profile drainage

Neon Flex

Critical areas:

• Extrusion quality
• End caps
• Cable exit
• Silicone-to-cable bond
• Field cuts
• Bend stress
• Water trapped in channels

Flexible Wall Washer

Critical areas:

• Lens-to-body interface
• End seals
• Cable entry
• Optical alignment
• Mounting punctures
• Thermal expansion
• Field connectors

IP ratings do not automatically prove:

• UV resistance
• Salt resistance
• Chlorine resistance
• Cleaning-chemical resistance
• Long-term outdoor life

Factory-finished lengths are preferable for higher-risk outdoor and underwater installations.

Cutting, Connections and Repair

A product advertised as “cuttable” is not necessarily field-serviceable.

Ask:

• Where can it be cut?
• What is the cut unit?
• Can the cut end be certified or tested after sealing?
• Who is permitted to perform the termination?
• Is an injection-molded end available?
• What is the replacement-section length?
• Can one failed section be bypassed?

Control Options

LED Strip

Usually offers the greatest flexibility:

• Fixed white
• Tunable white
• Dim-to-warm
• RGB
• RGBW
• RGBCCT
• SPI
• DMX through decoder
• PWM
• DALI through driver/controller
• 0–10V
• Smart controls

Neon Flex

Can use similar internal light engines, but cable count and heat increase with multichannel designs.

Verify:

• RGB mixing
• White-channel CRI
• Color consistency
• Maximum all-channel power
• Pixel length
• Voltage drop
• Cable-seal dimensions

Flexible Wall Washer

Common options include:

• Fixed white
• Tunable white
• RGB
• RGBW
• DMX512
• DALI-controlled static systems

Dynamic wall-washing projects require additional planning for:

• Fixture addressing
• Pixel mapping
• Signal distribution
• DMX termination
• Data repeaters
• Power and data injection
• Controller access

Installed Cost: Compare Complete Systems

The lowest product price per meter may not create the lowest installed cost.

LED Strip System Cost

Include:

• Strip
• Aluminum profile
• Diffuser
• End caps
• Driver
• Controller
• Cable
• Connectors
• Power injection
• Installation labor

Neon-Flex System Cost

Include:

• Neon product
• Factory terminations
• Mounting channel
• Clips
• Driver
• Controller
• Custom lengths
• Curved installation labor
• Spare sections

Flexible-Wall-Washer System Cost

Include:

• Wall washer
• Optical lens
• Mounting channel
• Driver
• Control system
• Data cable
• Photometric design
• Aiming or orientation
• Waterproof connections
• Façade access
• Commissioning

For façade projects, access equipment and rework can cost more than the lighting product. A mock-up and correct photometric design are therefore economically important.

Selection by Project Type

A Simple Selection Process

Question 1: What Should the Viewer See?

• Hidden glow: LED strip
• Continuous luminous line: neon flex
• Illuminated wall: wall washer

Question 2: How Far Must the Light Travel?

• A few centimeters into a diffuser: LED strip
• Direct-view emitting surface: neon flex
• One or more meters across a wall: wall washer

Question 3: Is Beam Control Required?

• No: LED strip or neon flex
• Yes: flexible wall washer

Question 4: What Shape Must the Product Follow?

• Straight or gentle bend: any, depending on optics
• Tight furniture detail: LED strip
• Letter or logo: neon flex
• Curved façade with wall illumination: flexible wall washer
• Compound three-dimensional curve: 3D product required

Question 5: Is the Product Visible When Switched Off?

Neon flex and wall washers have larger physical bodies. If daytime appearance is critical, request:

• Product sample
• Profile color
• Cable concealment
• End-cap appearance
• Mounting-channel detail

What to Request from the Supplier

For LED Strip

• lm/m and lm/W
• W/m
• LED density
• LED pitch
• CCT and color tolerance
• CRI/R9/TM-30
• PCB width and cut length
• Maximum run
• Profile and diffuser
• Thermal data
• Installed output

For Neon Flex

• Emitting direction
• Profile dimensions
• Bend direction
• Minimum bend radius
• Luminous-surface width
• lm/m
• W/m
• Cut length
• Maximum run
• Material
• IP construction
• End-cap method
• Cable direction
• Mounting channel

For Flexible Wall Washer

• IES or LDT file
• Beam and field angles
• Peak intensity
• Symmetric or asymmetric distribution
• lm/m and W/m
• Lens orientation
• Maximum wall height under defined conditions
• Required setback
• Vertical uniformity
• Bend direction
• Minimum bend radius
• Cut length
• Mounting detail
• Glare control
• IP and environmental reports

Mock-Up and Approval Procedure

LED Strip Mock-Up

Evaluate:

• Visible LED points
• Diffuser loss
• Profile temperature
• CCT
• CRI
• Task illuminance
• End-to-end brightness

Neon-Flex Mock-Up

Evaluate:

• Dotless appearance
• Brightness through curves
• Dark areas at connectors
• Minimum bend radius
• Daytime appearance
• Mounting-channel visibility
• End-cap quality
• Color consistency

Wall-Washer Mock-Up

Evaluate:

• Fixture setback
• Aiming
• Top-to-bottom brightness
• Scalloping
• Wall texture
• Glare
• Light spill
• Lens orientation
• Joint shadows
• Curved-section distribution

Use the actual wall material and color where possible.

Common Selection Mistakes

Using Neon Flex Because It Looks Bright in a Sample

A luminous line can look bright without projecting useful light up a wall.

Using a Wall Washer as an Exposed Decorative Line

Directional optics can create glare and uncomfortable high luminance.

Using Standard LED Strip for a Tall Façade

Total lumens do not guarantee vertical reach.

Choosing Neon by Profile Size Only

The wrong bend direction can make installation impossible.

Choosing a Wall Washer by Beam Angle Only

Peak intensity and complete distribution may differ even when the nominal angle matches.

Ignoring Daytime Appearance

Large silicone bodies, channels, end caps and cables remain visible when the lights are off.

Comparing Only Product Price

Profiles, terminations, access, simulation and installation can change the total result.

Treating Every IP67 Product as Outdoor-Durable

UV, salt, condensation, chemicals and thermal cycling require separate evaluation.

Frequently Asked Questions

Is neon flex the same as an LED strip?

No. Neon flex normally contains an LED light engine inside a diffusing and protective extrusion. A conventional LED strip is a flexible PCB that may require a separate profile and diffuser.

Is COB strip the same as neon flex?

No. COB describes the LED construction on the flexible PCB. Neon flex describes the complete diffused extrusion. A COB strip can also be used inside neon flex.

Which is brighter: LED strip or neon flex?

A bare LED strip often produces more external lumens per watt because it has fewer optical losses. Neon flex prioritizes a continuous visible line. Compare actual stabilized lm/m and W/m.

Can neon flex wash a wall?

It can create a nearby glow, but it usually lacks the controlled intensity distribution required for professional long-distance wall washing.

Can LED strip be used instead of a wall washer?

It may work for short surfaces or indirect effects. For tall walls, controlled uniformity or reduced spill, a wall-washer optic is usually more appropriate.

What is the difference between a wall washer and wall grazer?

Wall washing aims for smoother vertical illumination. Wall grazing places the light closer to the surface to emphasize texture with highlights and shadows.

Does a narrower beam always throw light farther?

It can increase directional intensity, but the result also depends on total output, lens efficiency, aiming, mounting distance and wall geometry.

What is 3D-bending neon flex?

It is a product designed to bend in more than one axis. The exact permitted movement and minimum radius must still be obtained from its datasheet.

What is a 3D flexible wall washer?

It combines multi-axis mechanical flexibility with optical lenses for curved or irregular wall-washing paths.

Which product is best for outdoor building outlines?

Neon flex is usually the best starting point when the luminous contour itself should be visible. If the building surface must be illuminated, use a wall washer.

Which product is easiest to repair?

A non-waterproof LED strip generally allows the shortest replacement sections. Neon flex and wall washers use more specialized sealing and optical constructions.

Do all three products need an LED driver?

Most low-voltage versions require a compatible driver. Driver capacity, voltage, circuit length, cable loss, dimming and environmental location must be coordinated.

Xmart Linear Lighting Product Selection

Xmart Lighting develops all three product categories:

• LED strips for coves, profiles, furniture and general linear lighting
• LED neon flex for visible contours, signage, curved lines and environmental protection
• Flexible LED wall washers for façades, curved walls and controlled optical projection
• 3D-bending wall washers for compound architectural curves

For a project-specific recommendation, provide:

• Drawing or façade elevation
• Desired lighting effect
• Wall height
• Fixture setback
• Surface material and color
• Curve direction and radius
• Direct-view requirement
• Required output
• CCT and CRI
• RGBW or DMX requirement
• Segment lengths
• Driver locations
• Outdoor exposure
• Required certification
• Installation and maintenance access

Xmart can then compare profile-based strip lighting, silicone neon and lens-controlled wall-washing solutions before sampling.

The correct product is not determined by which one is most flexible or brightest.

It is determined by the optical task:

Use LED strip to generate adaptable linear light, neon flex to create a visible luminous line, and flexible wall washer to place controlled light onto a surface.