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01-06-09, 12:49 AM
On my bike I have a DYI halogen system with 20W MR16 running overvolted at 14.4V instead of 12V. I've got regular 24 degree non-energy efficient bulb from Ushio. With 5Ah NiMh battery and a smart charger it was about $120. It is quite heavy, about 2.5 pounds, and it runs for about two hours on one charge.
Yesterday I received 900 lumen SSC P7D flashlight from DX. With batteries, charger and mount it was about $70. It is quite light, less than .5 pound and should run for 40(?) minutes on max.
I think the halogen light gives twice as much light compared to P7. On the other hand halogen light is of yellowish color and LED light appears a bit brighter. Assuming that P7 is four 3W LEDs it seems that light output per watt is about the same for LED and 20% overvolted halogen. Using energy efficient bulbs may add 50% more to halogen.
Yesterday I received 900 lumen SSC P7D flashlight from DX. With batteries, charger and mount it was about $70. It is quite light, less than .5 pound and should run for 40(?) minutes on max.
I think the halogen light gives twice as much light compared to P7. On the other hand halogen light is of yellowish color and LED light appears a bit brighter. Assuming that P7 is four 3W LEDs it seems that light output per watt is about the same for LED and 20% overvolted halogen. Using energy efficient bulbs may add 50% more to halogen.