Wiring Multiple HID Ballasts Together?

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I could use some help, I'm stumped.

I have a dual S50 HPS 250w setup, with philips 4000k, 90 CRI HPS Retro Metal Halide bulbs. Basically two ceramic metal halide bulbs, like a pulse start metal halide that runs on HPS ballasts.

Here's the problem, 90% of the time when I fire them up, only 1 will ignite.

I have 2 suspicions:

1) ballast to bulb length, The Advanced Ballast spec sheet says 2 feet, mine is 10 feet. It was ~15 feet, and I shortened it to 10 feet each from ballast box to bulb. Didn't help :(

2) wiring is toooo common, I basically have 1 power cord for both ballasts... maybe it's igniting only 1 bulb and ignoring the other one? resistance?

Any help would be appreciated! Thanks, Bill
 
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