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One more thing... be careful how you employ the lumens figure. It is a measure of the intensity of light, the amount of 'push' behind your photons, not the number of photons hitting a particular measured point.
Lumens are analogous to volts in an electrical circuit. Voltage is a measure of the energy potential or force pushing an electron, as opposed to current, measured in amperes, which actually is a measure of the number of electrons passing a single point in an electrical circuit (in coulombs per second if you want to be precise).
Lumens thusly don't "add"!
If you put a pair of 145,000 lumen lamps next to one another, intending to light a certain common area, the luminous intensity, as measured in lumens, is still 145,000. Neither light became brighter (or more intense) because they were placed next to one another.
This is why 100 x 1500 lumen CFLs won't grow plants anywhere near like a single 150,000 lumen (1000W HPS usually put out ~145K lumens) HPS lamp. CFLs are low intensity light sources and pairing or ganging them doesn't make them any more intense or brighter.
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