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...

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, ...

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...

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...

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 ...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

What are combination marker/clearance lights, and how do I mount them?

A combination marker/clearance light is one light doing the work of two. It must be at a 45-degree angle (on corners) to be legal. It needs to be marked...

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