It seems what I am looking for is a so called led droplight (or stem or canopylight). When I google that I get the same products from the same manufacturer every time again.

Is that any good?
Are there better non-diy alternatives?

The x-mas tree light design looks like it would take up a lot of space and wouldn't spread the light evenly and the net design would have to be hung vertically, because otherwise it gets too much in the way.
So I could only hang about 4 or 5 of these per m2, while
Quote Originally Posted by knna
Percentages of IC lighting generally varies from 25 to 50% of the total light.
so I need 4 times that.

Nets like these that are less wide (deep) and have about 30 or 40 watts in power would be just perfect.
Especially if you could have the spectrum custommade.