For instance, you could kiss your kids on their heads rather than their cheeks for a few days. You could ask your spouse to do bedtime stories and baths for a few nights. But obviously, you canât be so careful in your efforts to prevent germs from spreading that you feel like youâre shunning your kids.
If you grow short plants, you should definitely try LEDs. 1  The first series of costs on the chart represents an electricity cost of $0.12/kwH, or 12 cents per kilowatt hour (a kilowatt hour is 1,000 watts being used for one hour). 2  $0.12/kwH was the US national average cost for electricity in 2011.
Assuming a cost of 8 cents per kWh, the signal costs about 20 cents per day or $73 dollars per year to operate. An equivalent LED signal would consume about 10 watts, or approximately $7 dollars per year. Even a small city with a few dozen traffic signals could achieve significant energy savings. Using LEDs instead of traditional bulbs can save up to $600 at a single intersection in one year (assuming eight signals); a single large city could save a million dollars or more, depending on how many intersections they have. Changing bulbs less often saves on labor costs, as well.