This is an update, also from a different part of the forum, so it's a duplicate post.
So I finally came up with a solution that I hope will work and I only spent $3.50. I had an old Everready flashlight 2 D cell with a standard el-cheapo bulb. So I bought a Maglite bulb 5 cell C/D LMSA501 The info I found on it was this:
LMSA501 is 6.0v, .92A, 5.5W, 3100K
But the package says 5 Cell, so I assume it wants between 7.5V-5V (the range of voltage from new to dead of 5 D cells), so I put the bulb into the flashlight, drilled a hole in the bottom of the flashlight and soldered a positive lead directly to the bottom of the bulb and drilled another hole and soldered a negative wire to the neg contact on the switch and took an 8 cell AA holder, shorted 2 of the cell spots and am running 6 AA 2500 1.2V for 7.2V and around a .3C draw off of the batteries, which should be fine for NIMH ULD cells.
I only have 2 concerns, 1 is that rechargeable cells tend to come off the charger at 1.6V and then fairly rapidly drop to 1.2 and stay there for the majority of the discharge, so this would put the initial voltage right off the charger at over 9V, which I am not too happy about. The other thing is the heat from the bulb. This thing is bright, but then it's winter and I will only be using it at night when it is even colder.
As for light, it's great. It throws a mean torch even in well light areas, which is one my primary problems. If you don't live in the city you won't get this, but the streetlights are very bright and then when you are under a tree you can't see anything because your eyes are adjusted to the lights of the streetlights. With the streets being in such poor condition, it becomes dangerous.
The flashlight is attached to the handlebars with 2 hoseclamps (interlocked, one on the flashlight and one on the handlebar) and since there are no batteries in the flashlight, it's really light so I don't see any problems there.
Has anyone tried anything like this? Also, I have it aimed very low because it is really bright and I don't want to blind drivers.
If anyone wants to see pictures, I'll be happy to upload a couple.