11:39AM | 09/23/06
Member Since: 09/22/06
1 lifetime posts
I am considering installing 12v ac/dc low voltage lighting. The bulbs are rated at 50watts/12V. What would be the power consumed? Is it 50w at 12v or 50w at 110v.

Would these bulbs generally provide a lower electricity bill?


01:37PM | 09/23/06
Member Since: 04/25/05
1915 lifetime posts
You pay by the (kilo)watt-hour. It does not matter if the load is 12 volts or 120. If it is 50 watts then that is the load.

The 50 watt/12 volt light bulb will draw 50/12 = 4.17 amps. That is from a 12 volt transformer. That transformer will draw (less losses) .417 amps from the 120 v lines.

A 50 watt/120 volt bulb draws 50/120 = .417 amps.

Where you MIGHT save some power is that with MR-16 bulbs is that you can more often place the light more specifically where you want it. And thus need less total wattage.

But you can get MR-16's in both 12 and 120 volt version.

But 12 bulbs and fixtures are more common.

If you really want to save power then get CFL's.

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