I don’t want to spend too much money on lamps, and the space between the window, the plants and the curtains is very small, so i don’t think it would be wise to put some 100W of heat right next to the curtain. I think these are okay: 10 euro’s for a 15 Watt CFL (the site claims it gives light as a 75 Watt incandescent).

http://www2.conrad.nl/goto.php?artikel=610325

and the manual (in german  )-: ) is here:

http://www.produktinfo.conrad.com/datenblaetter/600000-624999/610325-da-01-ml-MegamanErsatzPflanzenlampe_ESL_15W_de_en.pdf

There’s a graph of the spectrum, which looks like it’s intende for plants, but i’m not sure if it’s not just a waste of money because they’re either to weak, or simply too cheap… Anyone?