How to calculate electricity when using 404 wat LED grow light?

[MarieM]

Recently bought a 404 wat LED grow light, I want to know how to calculate the electricity? any helps?

[Xena]

There was just a thread on this a couple days ago you can scroll down and find it pretty easy.
1000 watts used per hour is a kilowatt hour (that’s the way electricity companies charge you) so take the number of hours per day x .40 x 30 days x what rate your electric company charges per kwh.

[quirk]

This is my go to. The one on my phone is too small.

[MeEasy]

Turn off everything else in your house except the light for one full month and look at the bill...

hahaha satan made me say it hahaha

watts x hours/day ÷ 1000 = daily energy consumption x energy costs from your bill = daily cost

[Ziemelblazma]

You can buy 10$ socket power meter on ebay or where ever. The power lights will use most often is lower than power written on the lights, and also use less when dimmed down, if that is doable on Your lamp.