I thought that I have posted about this efficient T8-LED bulbs here. I was going to update, but I can't find the original thread. Maybe I forgot to post it for some reason. But here is the link to the detailed conversion of shop light etc (from 2 years ago). I've been using at least 50 bulbs of Sunritek T8-LED bulbs to grow carnivorous plants and orchids for 2 years. I used more bulbs for the household fixtures, but they are not used for a long hours like grow light. Some of them are in high humidity grow tents, but none of them has failed, and I'm pretty happy with this. Now it is not the top efficiency. But compared to T8-LED bulbs or LED shop light commonly available from Lowes etc, it is still at least 20% more efficient. Anyway, I didn't have any more fixtures/shoplights to convert, so I made a frame with left-over lumber. It's nothing fancy, but I thought that some of you might get some ideas from it. Here is the link to my Orchid Borealis blog post about this. Instead of adding this info to the original blog post, I made a separate entry.