Just return the defective lights already. You could have packaged them and taken them to the Post Office in less time than it took you to write the posts in this thread.

Action LED is a reputable company with great customer service. I'm sure you'll get either replacement lights or your money refunded right away. I just purchased a Gemini Duo from Action Led, ordered it last Friday afternoon, and it was in my hands Monday at noon. I also bought a second generation MS "900" 808 P7 from Action in 2010, it arrived in only a couple days and it still works fine after more than 300 hours use. MS lights are cheap, but most of them work.

Consider Dinotte as an alternative taillight supplier. I've used a 140 taillight hundreds of times since purchase in 2009, and it still works like new and is very bright. The Dinotte 300 taillight is slightly brighter but has a better mount and is more compact with integral battery. The 400-Li is Dinotte's brightest taillight but does require separate Li battery. There is also a 400-AA model powered by 4xAA NiMH - it looks the same as the 400-Li but is approximately the same output (and cost) as the 140.