cheap metal halide $14.00 U.S

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Look at the size of that lamp! 4.625" diameter is very difficult to work with. Most builders consider Ushio retrofit lamps (< 2" diameter) to be the largest lamp they want to fit in a reflector, etc. They pay a premium for double-ended lamps less than 1" in diameter.

Does $14 vrs $38 make that much of a difference when you spread it out over 20000 hours of operation?
 
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