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Calculating LED bulb wattage?

Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=71808
Printed Date: May 13, 2025 at 4:43 AM


Topic: Calculating LED bulb wattage?

Posted By: damo666
Subject: Calculating LED bulb wattage?
Date Posted: January 30, 2006 at 3:01 AM

Hello,

I'm looking for a bulb to use as the warning light for my alternator. The bulb needs to be less than 2w, or it will blow the alternator regulator.

I have a LED light here that has the spec's of "DC500v 100M" (its a 12v led). My calculations show that this equals a 1.44w bulb....have I calculated it correctly??

Ta
Damo



Replies:

Posted By: infinkc
Date Posted: February 09, 2006 at 10:40 PM
P=V^2/R
500v^2/100000000ohms= 0.000000223watts

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There are 10 types of people in the world, ones that understand binary and ones that dont.


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