Legrand
Member
- Location
- New Mexico
I'm changing out a fixture from T12 to T8's and I'm wondering how to choose my ballast. They're 18" lamps, I need a little more understanding on the ballasts to use, I'm on a Island so without ordering them from the mainland I only have a few to choose from. How do you tell what size lamp it's for in length, or do you just go by the wattage? I'm confused. Thanks.