I’ve made a new instructable which can be found here.
The instructable covers how to make a grow light for indoor plants. I made the light because I planted some tomatoes a few months ago, and at this time of the year there’s only about three-four hours of sun in Norway.
It was a lot of soldering, but what I liked the most about the project was the 3D modeling of the light holder which sits on top of the green house.