I have equipped all my bikes with cheap lights from Chinese vendors on eBay. No more paying $25 for a piece of Chinese junk that cost $1 to manufacture. I want my Chinese junk at a Chinese junk price! The knock-off Knog lights (usually called Frog lights) are just as good for $3. In fact, the best recent purchase I have made is this:
For $7, it puts out a lot of light, has a great strobe function, and takes AAA bateries. I also got a 58-led clip-on headlight that even works ok in actual darkness.
For "being seen" lights, the Knogs, cateyes et. al of the world can suck it.