The very first bike lights that I ever put together were for a 24 hour race in Canberra in 2002 and they consisted of a couple of 12 V, 20W halogen downlights painted black and attached to the bars with a couple of hose clamps. The power source was a 12 V SLA battery that used to slot into a drink bottle holder. I had one wide angle which I used for singletrack and one narrow beam that I used on fire tracks. I had no headlamp (didn't need one) and I would from time to time have both lights on at once and this would blow the guys using Vistalites (they were the light of choice back then) out of the water!!
I then progressed to turning up some housings and using 6 V globes which were a bit smaller and the battery was upgraded from the SLA to a NiMH battery that I put together myself. I also used some plastic conduit fittings at one stage and mucked around with lots of configurations. I even put together an LED headlamp in a 35 mm film canister in 2003 (some of the younger members probably won't know what a 35 mm film canister is......this was back in the olden days!!).
Anyway, I found a few photos and thought I would put them on here for a laugh and then hopefully in the coming months I will be able to post something up that is a bit more modern once I get off my arse and put together a light using some Cree LEDs.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Old School Lights