I have been speaking to Jason Bedell, owner of Lumatek, today about their ballasts and the problems with Vaportrail's "blown bulb" problems. It seems that not just Lumatek's but ALL digital or "E" ballasts have a compatibiltiy problem with Hortilux, SunMaster, Agrosun and other "high end" bulbs. It seems that MOST HPS bulbs require 4000-5000 volts to "fire" the bulb and all digital/"E" ballasts fire in this range.
It also seems that Hortilux and these other manufacturers have designed their bulbs to fire at a much lower 1500-2000 volts and these digital ballast a surging over twice that through these bulbs. Therefore, this overload is blowing out SOME (but not all) of these types of bulbs. Anyway, because the Lumatek is not strictly an electronic ballast (it has chip circuitry), Lumatek has redesigned the chips in the latest production models to fire at any voltage requirement between 1500-5000. Now, the Lumatek's will work with any bulb of your choosing and this is the only ballast that can make that claim. Because of the chip technology, Lumatek is the only digital/electronic ballast on the market that even has the ability to alter their firing range.