This is NOT a review of Amazon, but a review of the bulb. I bought four of the #9266 lights which each came with a 9166B bulb. All of them worked when I first installed them, but a week later one of the lights quit working. I swapped bulbs between two of the units and determined that the bulb was bad. For as expensive as these things are I expect them to be more reliable. I've had similar disappointments with other fluorescent lights from Lights of America. Considering that the lights are made in China, why do they have this name? The only way I can see to get a reliable light is to buy several and throw away the bad ones. Not very cost effective. I wish somebody else made these things.As for the claim that they put out the equivalent of 500W, I used these to replace four 400W metal halide lights. There is no way these put out as much light as my old lights, but I am glad to be rid of the high electric consumption and the buzzing.