I agree Newt. PUR-efficiency is a better way of comparing how much photosynthetic "power" you get for the electricity bill.
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The standard measure that quantifies the energy available for photosynthesis is "Photosynthetic Active Radiation" (aka "Photosynthetic Available Radiation") or PAR. This is blue and red light.
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PAR is everything between 400-700, so that contains green too.
PUR is PAR too, but weighted towards a general photosynthetic action spectrum - which limits the importance of green and yellow.
Aqua Botanic-light bulb comparison