I was trauling the web last night and came across an experimental grow, the bloke used the cell that collects light on a solar powered garden light in his soil to stimulate the roots by electric impulses, his experiments concluded that the less wattage and light capacity the better it worked so i reckon if you google (electric impulses in my cannabis plants soil) and read up on it then the light watts dont matter. he says that 1 leaf harnesses 0.1 percent energy from light but these solar cells harness 12 percent. all you do is get one of these solar powered lights break it apart so you have the solar panel with 2 electrodes and stick 1 in one side and 1 in the other side, then position the panel so its catching the light from your bulb. i was amazed by his experiments also a farmer uses electricity under his fields and has maximised his crops due to electrifying the rootS. i urge you to google this and read up on it as it will make your plants like they were under 1000 watt light