A local greenhouse contacted us to see if we could repair these Philips driver boards for their GP-SON 1000W lamps. We found a common fault and a solution to all 6. In the process we've invested in a fixture and lamps to test the units under operating conditions to ensure quality control. Large greenhouse can save a substantial amount by having these repaired instead of buying new. Discounts for sending 6 or 12 at a time, We give a one year warranty.