Ole,
Yes, I missed those lights required ballasts left in place. There are a number of reasons to not do so.
- The ballast needs to still work.
- There is power still wasted by the ballast.
- The bulbs themselves are less efficient. One typical comparison is 2000 lumens from 18 watts instead of 2400 lumens from 18 watts.
Wiring in direct wire is as easy as it gets. The two connectors at one end get hot and neutral. The other end is not connected at all.
I bought a number of different ones from earthled.com and was happy with the product and their service. I've been happy with these: https://www.earthled.com/collections...nt=32907738255