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The GMC Sierra is an excellent truck, with plenty of modern features. GM started including LED components in the headlights but stopped short of full LED. With upgraded headlights from Form Lighting, you can add full LED functionality to your truck, along with a number of modern features.


Triple Projectors. What’s better than one projector? Three projectors. And in these headlights, all three are bi-LED units, providing output for both low beam and high beam illumination. With a sharp cutoff, broad width, and high intensity, these units provide a serious upgrade in output.


Modern Styling. Inspired by the late-model Sierra styling, these lights will give your truck a much more modern appearance. This includes an LED turn signal along with a distinctive C-shaped daytime running light (DRL). If your factory headlights don’t have a DRL, no worries! Installation of this feature is simple thanks to the included harness.


Startup Sequence. These headlights are packed with the latest and most modern lighting functions, including a startup or “welcome” sequence. Anytime the running lights turn on, they will illuminate in a two-stage chasing sequence that is sure to turn heads, with an ultra-premium look.


Sequential Turn Signal. The startup sequence isn’t the only thing that stands out. These headlights also feature an integrated sequential LED turn signal. Every time the turn signal is activated, amber LEDs activate in a smooth, chasing sequence. 


OEM-Grade Construction. Form Lighting headlights are built with quality in mind, using OE-grade materials and design techniques. This includes durable UV-coated polycarbonate lenses, automotive-grade LED emitters, breather vents, and OEM plug-and-play connectors. They are assembled in an IATF 16949-certified facility, which is a quality management system designed for the automotive industry. While they may not be the cheapest option you’ll find, you can rest assured that these lights will provide durable and superior performance.


Road Legal. Form Lighting headlights meet all SAE, DOT, FMVSS, and CMVSS standards and regulations for legal on-road use in the United States and Canada, when installed and aimed properly - which is easy to do with the integrated screw-type adjusters.


Plug-and-Play, Bolt-On Install. Our headlights for the Sierra are completely plug-and play and will fit perfectly, bolting right up to the factory mounting points without any gaps. They were designed to plug into the factory headlight connectors, with no wiring modifications needed. No errors, flickering, or hyperflashing! If you’d like to enable the DRL feature, a fusebox wire harness is included, which does not require any wire cutting or splicing.


Two-Year Warranty. All Form Lighting products are rigorously tested for reliability, and backed by a two-year warranty. The warranty is supported directly by Form Lighting, and any replacement parts, if needed, are shipped quickly from Form Lighting’s US warehouse. On the rare occasion that you may need to utilize your warranty, we try to keep the process as simple as possible - for example, no return is normally necessary.



Application: Headlamp

Make: GMC

Model: Sierra 2500/3500

Years: 2015, 2016, 2017, 2018, 2019


Operating Temperature: -40C to 85C (-40F to 185F)

Connector(s): OEM-Size Plug and Play

Intrusion Ratings: IP67 Weatherproof

Unit Weight (lb): 9.35

Product Weight (lb): 18.7

Shipped Weight (lb): 23.05

Application: Headlamp

Make: GMC

Model: Sierra 2500/3500

Years: 2015, 2016, 2017, 2018, 2019

Quantity: Pair (Left and Right Side)



What's Included

Quantity: Pair (Left and Right Side)



Installation Time: 1-2 hours

Tools Needed: Basic Toolset

Modification: None

15-19 Sierra 2500/3500 FORM Projector LED Headlights

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