Spec me mate!! I have played around a bit over the last few months with the cheap, driver-less 50W led COB chips from China.
Actually for a work project.
My take is that for a small area they may be ok. Cheap enough to be able to have a few spares.
Had two fail so far out of the 16 i bought. Failure popped the RCD i had them plugged in through.
Set up one unit like this.
As a test piece. Gets hot fast if that fan not running.
Also set up this:
And actually did run it as a grow light in my tent a while. Till a chip failed and popped a circuit breaker. Again, gets hot without the fans. Needs active cooling. Its currently running 12/12 on a small project at work and has been fine for the last couple of weeks.
Light output?? Tests i did a while ago. Used PAR meter.
600W Lucagrow HPS
Ambient PAR for test 003
@ 400mm 1067 umols
50W COB 1 chip Unit Draws 86W
Ambient PAR for test 011 Stable temp 40 Degrees C
@300mm 146 umols
200W COB 4 chip Unit Draws 298W
Ambient PAR for test 011 Stable temp 68 Degrees C
@ 300mm 360 umols
@ 420mm i get 487 umols out of the 2 COB "600W" unit i got off eBay for a bit over half the power draw of my DIY effort.
So........my advice is avoid the driverless, plug straight in AC type chips. Cheap, but even the bottom end of the eBay / off the shelf COB units are i think better value overall.
Safety issues as well. I made sure to enclose everything so i cant get zapped and, hopefully, not burn the shed or my workplace down.
Manager frown on that kind of event. Tested with the light meter and a layer of perspex for the chip to output light through makes no practical difference to available output.
I have seen some VERY dodgy brothers DIY electrical setups around the forums.
anyhow, sounds like you are headed to a nice setup. good luck.