W21Y & W21R Review.
W21Y & W21R Review. I ordered 2 different type of bulbs separately mainly because i was skeptical about the product at first. I was pleasantly surprised about my first purchase was the W21 amber bulb. The installation was easy plug n play. I figure it is polarity reverasable because first try it turned on. It is BRIGHT yellow way better than stock. No flickers so far! The W21 red brake light was easy install and perfect fit. It is very bright too, way better than stock halogen. Both were hard to find because of my year and model of my truck. I am very happy i was able to find a compatible bulb with ALLA.