First my attempt with luminescent lamps was really weak: no, it was not enough to let my flowers grow. So, after 1 month has pasted, I can present my new system with: 1. Mercury lamps 125W each piece. 2. New metal lampshades that can resist these heat lamps. I am very proud of them, because I had never worked with sheet metals before. 3. New radiator for triacs (that operate on the quite powerful lamps).
Quite bright light
There throttles are seen (I used old russian devices, we still use it because of some their advantages) and the radiator is, too.
I could not say that these lamps are very powerful: I checked, the resulting illumination of the ground is 5 times less than for the clean summer day in Saint Petersburg.  But, it is enough to support my plants alive (they grow now quite well).