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250W HPS test board
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After my 100W mercury vapour test board, here's a 250W HPS one! I found a pair of 250W HPS ballasts last Thursday at school. One is an Advance 120/277/347V (pictured here) and the other is a 347V Magnetek.
On the Advance ballast, the ignitor was shot, since I had nothing to lose, I opened it and found a 6K power resistor that crumbled apart. I replaced it by a pair of big 12K ohm resistors in parallel and it now works like a charm! The ballast is gonna live on this test board, which includes a 12V start/stop circuit!
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But from a lighting enthusiast's point of view, it sure is cool to use relays, no matter their voltage!