Pricing and details for the Diode Dynamics SL1 and SLF LED bulbs: https://headlightrevolution.com/led-h... One of the most common questions we get about upgrading automotive headlights is “Will a LED headlight bulb work in my projector headlight housing?” With the RIGHT bulb (like the SL1 bulbs), yes! In this video, Chris answers that questions by reviewing the Diode Dynamics SL1 LED headlight bulbs, and testing the bulbs inside four different projector based headlight housings. Historically, at Headlight Revolution, we've been slow to recommend using LED headlight bulbs inside projector style headlight housings. And rightly so. As you can see in two of our other YouTube videos below, LED headlight bulbs typically don't perform well behind a projector lens: But as LED bulbs like these Diode Dynamics SL1 LED headlight bulbs are designed and created, we've begun to see the light. (Pun intended.) Only SOME of the current LED headlight bulbs on the market actually function inside a projector headlight housings. As you can see from the testing in this video and the following lux numbers, the Diode Dynamics SL1 LED Headlight Bulbs are a perfect option for LED bulbs in a projector headlight.