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>Posted on 30 Jul 1996 at 18:48:29 by Peter N.R. Heseltine I wrote Peter regarding short arc HID lamps: >expect the lamp to last 10k hours. >Expect about 8000 Volts to initiate the "spark". >Expect about 80 Amps to get it running. >(Unitrode makes a "ballast" that does just this: the UCC2305 and UCC3305.) > >Maybe its's my lack of knowledge, but 8000v sounds a little too wicked for >me and 80A too pricey, though that might only be for a few minutes, til >it's firing. Heat's a problem too. Rich, you could actually preserve your >specimens by pointing the light at them and frying the fish on the fly. The high voltage is needed to ionize the gap and get a current going. The high initial current is needed if the light is to come on quickly. We're just talking fractions of a second here but the high voltage will require some care in putting a system like this together. >So the HID is on the horizon, if the auto industry gets into the picture >the price of the lamps should come down and they may well be OK to dive >to 100' or so, off the shelf. Rod Farb, did you ever get to use one of >the L&M HIDs? As far as I know they are only making low-beams with specialized beam patterns. General purpose lamps are still expensive due to small runs (Welsch Allyn short arc lamps costs of the order $200). Regards, John
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