General

What’s the difference between an acrylic and polycarbonate lens?

Given its weather resistance and clarity, acrylic has long been the most widely used material for lenses. However, polycarbonate is much less likely to shatter, chip or crack upon impact and can withstand higher exposure to heat...

Are your LED lights polarity-sensitive?

By nature, LED lights are polarity-sensitive. If the voltage is of the wrong polarity, it is said to be reverse-biased. Very little current will flow, and the device will not light up. Truck-Lite has developed LED lights that are not polarity...

Is there a Lifetime Warranty on LED lighting?

Truck-Lite offers a variety of warranties, depending on the product. Products that qualify for our limited lifetime warranty show the following symbol:  To learn more about our warranty programs, visit the warranty page.

Where can I buy Truck-Lite product?

Great question! Visit our distributor search to locate a dealer near you.

What does FMVSS-108 stand for?

In the United States, the Federal Motor Vehicle Safety Standards No. 108 (FMVSS-108) is the federal regulation that defines the use of exterior lighting products. It is over 168 pages long and includes a number of written interpretations...

Why are my lights cracking?

Most lights are made from polycarbonate which is the toughest, highest melting plastic generally available. However, it can be attacked (which causes cracking) by some chemicals or cleaners. The answer is to avoid incompatible cleaners and/or to use ...

Are clear lenses legal on rear stop/turn/tail lights?

Yes. The Federal Motor Vehicle Safety Standards clearly state that measuring the performance and color of a lamp assembly is done with the light source energized.  There is nothing illegal or non-compliant about red or yellow LEDs behind...

What is the difference between FMVSS: PC and FMVSS: P2?

P2 is the minimum standard for clearance, side marker, and identification lights. All Truck-Lite lights meet this standard, even if they are marked PC, P3, etc. PC lights are to be used as a combination light, meaning the light should be mounted on ...

I’m painting my vehicle. Do I need to worry whether or not a little bit of paint gets on the lights?

You should be careful to avoid getting paint on the lights; most paints (excluding water based) are incompatible with polycarbonate lights. They may also cause wires or cable insulation to crack.

The lenses on my customer’s lamps are hazing and cracking. What’s the deal?

Hazing and cracking are almost always caused by incompatible chemicals or cleaners. Although polycarbonate lenses are generally very durable, they can crack due to the combination of stress induced by the molding process combined with accelerated...

My customer is experiencing under voltage. Can I fix the problem by simply turning up the voltage?

No, a proper fix is required for safe and efficient operation. Under-voltage is often caused by poor electrical connections.

Can I ever use the Model 40 with reflex reflector ring legally?

Yes, the Model 40 with reflex reflector ring can be used in the following situations: -On any vehicle under 80” wide -As an “extra” light on over 80” (reflex is legal) -On vehicles made in 1991 or earlier, when installed by the vehicle's owner (although...

Is it okay to mount a lamp at an angle that isn’t “square” on the vehicle?

The legality of a lamp's positioning varies on a case-by-case basis, often requiring a special lab test for each position. However, Truck-Lite products specifically state the proper mounting position(s), so you can be sure that your lamp and its...

Is it illegal or non-compliant to use LED lamps that have clear lenses, but produce red or yellow output?

No. There is nothing illegal or non-compliant about having red or yellow LEDs behind clear lenses. When illuminated, the effective colors of the lights are red or yellow, which are approved colors of SAE J578c requirements. Clear lenses are legally approved...

What is the 12 Square Inch Rule?

On December 1, 1991, the National Highway Traffic Safety Administration (NHTSA) made effective the final ruling regarding the 12 Square Inch Rule. This ruling requires that the total luminous lens area for a stop and turn light must not be less than ...

How hard should I tighten down (torque) plastic lights or devices?

Over-torquing will generally cause cracking or distortion. Use the torque specifications provided by the manufacturer. A marker light will generally be in the neighborhood of 8 to 20 inch lbs., but a good rule of thumb is to use the minimum...

The vehicle has everything needed for FMVSS-108, but the State Police gave me a ticket anyway. What’s the deal?

States can regulate anything not covered by FMVSS-108, such as any accessory lamps or lamps that are not mandated by FMVSS-108. Generally, the problem is in these areas; sometimes, however, it can simply be a mistake...

What lights do I need?

Check the specific vehicle requirements or contact Truck-Lite Technical Support. Note that states cannot require anything different than what is in FMVSS-108; however, states can add regulations. Contact Truck-Lite for special situations...

What is the best method to clean polycarbonate lights?

Mild soap and water is usually enough. Caution is necessary if further cleaning is required, as many common household cleaners are not compatible with polycarbonate. A list of cleaners that can and can’t be used can be found here. (<link)

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