Well, i've tried a few more things... First I should clarify one variable that may or may not be fully proven out... When I bought the ballast from Aquarium Adventure about 14 months ago it was listed at 175W on the price label, however once I got home I noticed it said dual 150W. Anyway, after discussion with AA they said 175W bulbs would fire fine so I ordered 2 x 175 Hamilton 14ks since there are few kelvins offered in single ended 150W bulbs. These bulbs worked great for about the past 13 months and growth was great in my frag tank which is a shallow 4'x4'x16" tank. All good!
Now that it failed I picked up two more 175W bulbs that are 12k and they too are not firing. Could it be that these bulbs won't fire while the others did?
So, i've tried new outlets, tested with a simple little electical gadget that has a positive/negative side and small led to test open circuits. I've confirmed that it is not the power cord and that current is flowing to the outputs on the ballast where the lamp cords hook in... Not sure on voltage here.
When I called Sunlight Supply I got a less than helpful guy that pointed me back to my point of sale, which was AA. After a bit of discussion about my experience with SS customer service, Jason at AA was very helpful in getting me details on the RMA process. He said SS told him that 9 out of 10 that get returned work fine when they test them... This has me worried that maybe, just maybe a 150W bulb might fire and then I'd look like a schmuck for not using the right bulb size.
Anybody have an old 150 single ended bulb I can borrow to test with? Anyone else run 175W bulbs on a 150w ballast? I have PCs over the tank now in hopes not to lose all my corals as I sort this out.
Thanks for your help!