Hey thanks for the reply, I actually linked the bulbs, perhaps it didn't stand out enough, the bulbs are 85-250v so will work in the uk on 230v no problem, I just need to get some either gu10 or e27 bulb holders... 84 of them if I stick to this first plan. I have found some other bulbs that are 40-50 watts and have exactly the same spectrums that I am considering as I will then only have 21 lights rather than 84.. Which I can see being a serious ball ache to wire up. Another benefit to having only 21 is I could get a 24 gang rocker switch unit.. It does sound the most appealing, but I just wanted the light spread as evenly as possible throughout the box.

The diagram I have made is going to be floating mdf/plywood with the lights attached, problem on some sort of rope pulley system to move up and down inside the box with a channel across the top for an exhaust ventilation, I plan on putting fans on this board but I have yet to plan where they will be, maybe every other plant will have a fan in the middle of the lights but I am aiming at having about 4 fans through this board so I can control it with one of those PC temperature controllers on eBay that will automate the fan speeds to match my set ambient temperature. So all the fans and that controller, possibly also the irrigation pump and reservoir circulation pump will be able to all run off a computer PSU as those things are pretty fantastic.

I guess I just needed to know if there will be enough light, if there is far too much light or if its just a ridiculous idea. Might all sound complicated but I could theoretically control every light with a separate gang switch or change out bulbs for more red or more blue.

But is there enough light per plant with these 40-50 watt bulbs?