Nice idea, but the CFL ballast will expect a real sine wave-not poor AC from an inverter. This will not only create flicker but will drastically reduce bulb lifetime. As others have pointed out, HID lamps are a much better solution. Also, I have found some 25W LED arrays that could be promising if they didn't cost so much (around $150/bulb without driver or heat sink). The CFL is not going to meet the legal light output requirement which is something on the order of 1500-2000 lumens or more, I think... I understand where you are coming from as I have an underdrive pulley on my Metro that makes it to where the alternator can barely keep up with the stock sealed beam lights.
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