On Sunday, May 6, 2018 at 12:32:50 PM UTC-4, Tom Del Rosso wrote:

Are those designed to work in series with a ballast?

Some do, some come with a bypass that fits into the starter socket. Depends on which you choose. I prefer the latter as the system is more simple in place. But that option costs a buck or two more.

Peter Wieck
Melrose Park, PA