5ft PL lights are very difficult to find. Most LFS carries up to 4ft only. Not knowing NA has it late last year, I had mine custom with wood for 3x36W PL lights. Had a hardware shop to fix up the lighting and connections + supply of reflector, ballast and Osram PL lights. Total cost for 1 set was abt $160 including workmanship of $30. The ballast cost abt $28 for 2x36W and $22 for 1x36W. Each Osram PL lights cost me $18. That is already $104. If I use 2 sets of these lights, I only achieve 216W compared to 220W with these 4x55W lights you mentioned. So I think it is quite worth it to get from NA.
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