Electronics - Running HID lights from PC power supply

Submitted: Wednesday, Aug 15, 2012 at 16:38
ThreadID: 97430 Views:3446 Replies:5 FollowUps:7
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G'day , this is probably not the forum for it but I've received a lot of advice here from people who are fairly knowledgeable in electronics etc so giving it a shot.

I've got two HID 55W globes with Ballasts that I'm trying to power with a computer switchmode power supply. When I test the HID lights off a battery they work well & I measure 9.5 amps drawn for the two of them. When I connect to a PC power supply on the +12v rail it lights up for about 30 seconds then shuts down & needs to be unplugged to try again. The PC power supply is 400 Watts with 17amps on the +12v ..

I tried 2 power supplies (300W & 400W) & both doing the same thing.. One thing I did notice is when I turn it on it starts at 12v then slowly drops to 8V then dies..

I'm going to try get my hands on a higher rated PS but thought I'd ask the question here incase someone knows

Thxs Don
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