Think you could try the growers reward program from California lightworks. You could test out a solar storm 440 which will handle 2-4 plants for you with no problem. What they do is you have to put a deposit down or a hold on your credit card. They mail you the light and you keep a grow journal. Post regularly on your progress and then after you've harvested if you like the light you can buy it for cheap. Or return if you werent satisfied.
That arrangement is music to my ears, do California Lightworks have a branch in Europe.....