I did it again. I cut my lighting electric bill by yet another third.
Now I'm using a photocell to automatically switch lights on and off that used to be
on 24x365. This last move reduces my lighting bill by about 35%.
It would seem that a photocell would save about 50% in lighting costs, as the average 24 hour period is about 50% daylight. But it isn't that simple: For safety reasons, I want the lights to come
on before it gets dark, and I want the lights to turn off after
it gets bright out side. Furthermore, not every day is loaded with
full sunshine. After chugging through the numbers, I pessimistically
calculate the my lights will be on about 65% of the time.
When I started this lighting efficiency effort, I was already considered efficient: I was using
CFL bulbs in all my fixtures. Yet I was still able to reduce my lighting costs by about
Further savings are going to be a significant challenge as I already use low-wattage LEDs, and they've been extremely reliable. Considering that my current bulbs have been extremely reliable (zero failures), it is a good bet that I won't have a bulb failure over the next 5+ years. Perhaps by then, more efficient bulbs will be available.
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