Might also be worth installing a dedicated curcit to the loft or running a spur if possable from the upstairs ring (30amp). Tapping into the lighting ring would be a sure way of starting a fire through over heating the wires plus they tend not to be eathed.
Thanks for posting this. I tapped into the lighting ring, and have been running 1 desk fan, 4 CFL's, a 150W HPS and 2x120mm PC fans off it. I've not had any problems, but I didn't realise that the lights might not be earthed.
Is there any tips for doing a loft grow with 400w light. In the middle of England in a classic semi
Security.
Temps etc
Im not a electrian but now a bit about wiring.
As i've said im not a Electrian so if anyone want to correct anything i might be wrong on please do.