20W MR-16 Bulbs. Those trying to squeeze more light should look at the Phillips energy saver lamps that produce 35W equivalent light for a power draw of only 20W. I have on in an Optronics driving light on my regular commuter. My favorite MR-16 though is the Solux daylight lamp, actual 35W lamp but beautiful white light almost like HID. I have one of those on my fixed gear secondary commuter. I prefer the simple roll your own light systems because it is so easy and cheap to replace parts and because...well, see my signature. I had a HID system, but the switch failed so I returned it. My $25-30 homemade is very close in light output with the Solux lamp. My commuters are not wimpy weight weenie machines so I don't care about a 4,7 or even10 pound SLA battery. Eventually I may switch to a 12-15 AH SLA so I can run the 50W Solux. Because I need it? Nah, just because I can. I use 54-LED truck brake lights on the rear. Hard to miss. With my light setup I feel safer riding in the dark than in daylight. In daylight I might get lost in the surroundings, but with the lights I have drivers can see me from a long way back.

The Phillips lamp costs about $10 and the Solux about $7. I have posted more complete descriptions of my setup a couple of times on this thread so I won't repeat it here. Every now and then I want to remind everyone of these lamps and the Optronics driving lights which, at $15 for a pack of 2 are perfect for homemade systems. I replace the stock 50W lamps with either the Phillips or Solux.