I originally plug them in series(4 wires in one end cap) the ballast was running hot and the end caps also( fingers on it maybe 3-5 sec)
then now i try to do them in parallel (2 in each endcaps and according to fulham is underdriven) and the ballast is still as hot but the endcaps are a bit cooler but it is definately not as bright as in series.
my bulb and ballast are around 3 months
but i just got one question that im worried. since fulham doesnt approved the wiring in series. what if something happens and the insurance wont pay since is not wired accordingly.?
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