logic

How do I convert watts to amps?

Watts divided by voltage equal amps.

A 400 watt ballast plugged into ordinary house current (120v) would draw 3.33 amps.

Using a little math we can see then:

Amps = Watts / Voltage
Watts = Voltage x Amps
Voltage = Watts / Amps
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But, the actual current draw for a 400W HID is more like 453 watts. Need to consider the power factor of the ballast/lamp combination.

Good to know if you maybe use an in-line fuse in the setup.
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