I used this thread as a guide to retrofit my stock lighting on my 20long. I had most of the supplies already. Just got two single sockets, the zip ties, and spray paint. Works great! I'm guessing I'm getting about 1.5wpg since I don't have the tank completely full. Both of my tanks are low-tech/low-light planted, but this diy project creates many possibilities.
I wasn't able to find the dual sockets, but at home depot they had a $5 ceiling fixture that could be stripped down for the dual socket. I got two of these because I'll probably convert my 29gal too.
Honestly the hardest part of this project for me was waiting for the paint to dry.
Great thread, Thanks!