ballast or no ballast
dlcw
I believe you will find two types at the Lowes & Home Depot... one LED that will run off the ballast and one that do not require the ballast..
I think most do away with the ballast, I put in a few 4 footers without the ballast and they are great...
I think you will find you only need one LED for every two of the old style you replace.
The decimal point seems to be the most important on the z axis... x & y not so much....
ShopBot... Where even the scraps and things you mess up and throw away are cool....