You could have swapped out the old ballast with one of the new inverter types and actually get a better efficiency than CFL. The spiral design of the CFL means that it tends to block its own light. Try shining a flashlight through a CFL (turned off) and you'll understand the problem.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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