My mom had a dusk to dawn sodium light in our yard a while back. She stopped using it because it got pretty expensive for her. You could come close to calculating the cost of letting it run all night. Take your old lights as an example at 2x250 W = 500 W and assuming 12 hours each night gives you 6 KWh per night or 180 KWh per month. If you pay $.10 per KWh the old lights would cost $18 per month to run all night. The cost of dusk to dawn lights would depend on the wattage.

I just thought it gave an ugly palor to everything.
Dave

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