wow...16 euros, that's $20 US....my wallet feels sorry for you...over here a 6 pack of 26 watt floros is $16 US...
I would try to get at least 100 watts per plant, my first grow was with 3 - 43 watt floros on two plants and it did ok....I added 85 more watts on the next grow and it did better, now I'm up to 400 watts and they're looking better still....
The envirolite that Hudson mentioned sounds like it would be your best bet.