actually i never really showed you guys the lights....
mine are pretty hap-hazard compared to the lights I build for customers because I always tried new things and changed stuff around alot but Ill show you anyway
1st i used surexi f1 by illumitex chips and made 2 60cm long bars passively cooled-28wx2
then I needed more
so I made 2x cxa2540 cobs from cree, also passively cooled 47wx2 but they were too hot so I swapped out the drivers an they became 11w x2
so at that point i still needed more light and realised id have to go with active cooling using a fan so got 2 more cxa 2540 and mounted them on cpu heatsinks using the original drivers(47w x2)
then seen as i was already using passive cooling I figured i would re-use the 60cm heatsinks for another project for a customer(250W)
so then I remounted the surexi chips onto a shorter bit of heatsink and added fans(28w+ i have 2 more surexi chips on another bit of sink that I can add to this string if needed so + 11w)
and I had another cxb2530 chip from cree that fit nicely on the driver with 3 surexi chips(32w)
by this time Id realised I dont wanna drill sinks too much because then I cant re-use them so ive employed kapton tape
sorry for the rant but yeah so there is about 187 electrical watts of light at my disposal this covers my 80x100cm(31.5 inch x 39inch) very very well
in terms of efficiency my lights are not very effcient by my standards(just above 40%) but in comparison to like led grow lights you can buy these lights would produce as much light as a mars 700 pulling 300w from the wall or in HID a bit more than what you get from a 250w hps (like a 300w hps if they made one) but without the heat