Funny how Tucker cars pioneered this 60 some years ago and just now the big manufacturers are finally getting around to this. It is one of the advantages I appreciate about having a light mounted on my helmet. Being able to turn my head and aim that light at cars that are coming at me from side streets is invaluable.

I agree with the sentiments about once having had a helmet light not wanting to go back, and believing in having basically two sets of lights. I run a flashing light on my handlebar, and a Planet Blaze 1/2 watt helmet light on the top of my helmet.

I also agree that having a light on the back of your helmet is vital as well, I use a Planet Bike Blinky 3H for this. Because when you are turning your head or lifting it the light will moved out of the line of sight of cars approaching from the rear I also run at least one other rear light, usually a Mars 4.0 on the seatpost or saddlebag, and a Portland Design Works 1 watt Fenderbot on the fender. I like having the second bike mounted rear light in case I am remiss in keeping the batteries charged and one of them goes dead, I still have another. All of my lights use AA or AAA rechargeables.

I wouldn't worry about the mounting systems for putting a light on top of your helmet being uncomfortable. I remember being concerned about this as well before I got helmet lights, but it's usually quite easy to run things so they are either under, or below the level of the pads in the helmet.

Although I am a big fan of DIY stuff, in this case I happen to have gone with purpose built items for my helmet lights. The PB Blinky 3H usually runs about 15-20 bucks. The PB Blaze helmet light can be had for about 25 dollars.

I'll admit I'm tempted to run a more powerful flashlight instead, but the 1/2 watt Blaze is actually quite bright with fresh batteries and since it runs on AA's it is easy for me to feed it fresh rechargeables.