Halogen mountain bike lights >> help needed

[kro]

I work for a place with lots of plastic pipes, so that was my plan skel. Thanks for the link twinkle, what sort of battery power did you use for that?. Thats a high wattage bulb, and quite high voltage too for a bike situation.

I'm gonna find some conversion charts I think.

[kro]

AH = AmpHours.

1 AH = runs 1 amp (current) for 1 hour.
So basically the capacity of the battery.

You can (roughly) work out what you need using the following:

Bulb wattage divided by battery voltage = current drawn.
Then Battery AH rating divided by current drawn = run time.

For example:
50W bulb, running on 12V battery draws 4.16Amps (50/12).
So using a 7AH battery will give a run time of 1.68 hours. (7/4.16)

Like I said this is rough, in practice your run time will be shorter than the theoretical one.
I think you get about 1:20 out of a 50W running off a 7AH?

Hope this helps and isn't too confusing...

[twinkle]

what sort of battery power did you use for that?. Thats a high wattage bulb, and quite high voltage too for a bike situation.

We had a sealed lead acid battery we put in the drink bottle cage, I can't remember how many amp hours it was though. Like I said I think it was only a 20W bulb, maybe 15W even, but man was that thing bright