Hey, Gaz
Thanks for asking, I haven’t DIY my own COB before 
And code “overgrow” is a special dicount offer for OG members, it can be applied in to any orders from our website.
For our white specturm light, like SP,TS,COB. they don’t have a fan inside, so that they will produce no noise.
By the way, do you know why our lights are cheaper than others with the same light output effciency ?