### LED Watt / Amp question

Posted:

**Tue May 28, 2019 12:10 pm**Hi, I'm controlling five 12V LED lights via a relay from my Pi.

These are the lights: https://www.ebay.com/itm/10W-LED-Flood- ... wEzxYc74E

The LEDs are rated 10 Watt each and I'm trying to work out what type of 12V power adapter I require.

My calculation is that each light consumes 0.833 Amp (10 Watt / 12 Volt), i.e. a total of 4.17 Amp for all five of them.

Rummaging around in my box of old power adapters, I could only find 12V ones rated between 0.5 and 1.0 Amp.

I hooked the 1.0 Amp one up and it runs the lights for extended periods without even getting warm.

I was expecting it to get hot rather quickly. So my question is: would the 10 Watt LED rating only be an equivalent value, similar to the LED downlights in my house, where the Watt figure indicates what incandescent bulb it resembles?

Or am I approaching this wrong altogether?

These are the lights: https://www.ebay.com/itm/10W-LED-Flood- ... wEzxYc74E

The LEDs are rated 10 Watt each and I'm trying to work out what type of 12V power adapter I require.

My calculation is that each light consumes 0.833 Amp (10 Watt / 12 Volt), i.e. a total of 4.17 Amp for all five of them.

Rummaging around in my box of old power adapters, I could only find 12V ones rated between 0.5 and 1.0 Amp.

I hooked the 1.0 Amp one up and it runs the lights for extended periods without even getting warm.

I was expecting it to get hot rather quickly. So my question is: would the 10 Watt LED rating only be an equivalent value, similar to the LED downlights in my house, where the Watt figure indicates what incandescent bulb it resembles?

Or am I approaching this wrong altogether?