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Really good thread
'just 310,000 watts of energy compared to 1.24 million watts needed to power the old system.'
seeing efficiency as an investment
Eh, the energy savings itself aren't a significant money maker, though they are a nice bonus. The cost difference in electricity between the different lights is about $150/hour. That's a drop in the bucket of the total operating cost for a stadium. It will take a long time, possibly even a decade or more to recover the cost in electricity to make up for the investment. My guess is that the real savings come from not needing to replace bulbs or require maintenance, which could get expensive really quick.