Electrician Talk banner
1 - 5 of 5 Posts

915 Posts
Hey guess, just wondering when sizing lighting loads do you go by the ballast or the lamp or both? Thank you

Both. If you look at the data sheet on any given fixture it will list the input wattage which includes both.
Rule of thumb used to be lamp wattage + 10% for the ballast. Electronic ballasts are more efficient than that now.
But it's still a good rule of thumb...
1 - 5 of 5 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.