Bah. Lights are only desirable if you want to maximize your chance of being seen by drivers. The rear light is a no brainer. A front light is handy sometimes if you see a car in the oncoming lane. He'll probably stay in his lane, but the guy behind him trying to pass him is guaranteed to use your lane to get around him. Unless he sees your blinking headlight. At least, that's my analysis, and I went to college.