Sizing lighting transformer

Old 04-12-20, 05:13 PM
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Sizing lighting transformer

Upgrading a 120V pool light to a 12V LED 35W lamp with a .8 power factor. Please check my calculations.
So to allow for the 80% derating, would I need a 120V pri 12sec xfmr rated at 80W? Thanks
Old 04-13-20, 11:28 AM
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Welcome to the forums.

Do you mean retrofitting an LED into a 120v fixture ?
Make sure the LED you buy is specifically for that purpose as the heatsink is very important.
Typically a 60w transformer is used for a 35w LED light.

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