In my case, I wasn't willing to have fan noise since this light set-up is inside my house. The quantum boards are effectively just a COB light with a different lay out - instead of the diodes circling around a stalk and being reflected downward by the housing, the LEDs are directly facing down on a big fat panel. This is also good for cooling, since they aren't stacked all around each other. They are mounted to an extruded, anodized aluminum heat sink that gets better light distribution and cooling. A lot of the COB rigs are really expensive if you're buying them commercially a la Timber. Homebrew like Brad is pretty decent pricing.
With the two 260w boards I have, the boards and the heatsink barely get warm - it's just the driver that runs even slightly hot. It's kind of a bummer actually cause I wanted some ambient heating in my house from them...
There are so many ways to do this. You can even just buy some cheap fluorescent bulbs from Home Depot and have a bunch of little work lamp housings, which is probably sufficient and cheapest. I plan to use my lights for other endeavours later on, so I wanted something higher end than that, and also didn't want some weird aesthetic in the corner of my house... Though I guess it's still weird since it glows like the gotdamn sun. 
The better LEDs will have some of the Infrared spectrum but from what I understand, it does not contain UV. The papers or videos I saw showed that T5, Metal Halide and HPS give off some UV but they are giving off UV A and the plants want more UV B. There was something being mentioned about a one to thirty ratio of UVB to UVA, respectively, that natural sunlight gives off but I don’t remember the exact figures.
A lot of the information regarding UV requirements out there is geared towards growing medicinal flowers and the UV light is supposed to increase THC levels. More research needs to be done to see what role UV light plays in the everyday life of tropical fruit trees grown under artificial lighting.
Simon
LEDs have UVA at the and of the UV spectrum but its harmless and reads zero on my pretty accurate UV meter with the ,,UV ,, led glued on the sensor.
On the otther hand,all light emitters that are made of glass,neon tubes,MH,HID and even the old incandescent lamp ,they all have quite a serious ammount of UVB and UVC.
Neon tubes are used in the brozing saloons for womens that have such a high output that it tans the human body.
Various UV sterilisers bulbs are also made from neon tubes or they have a glass bulb ,a HID or a MH,etc.
You will never see LED as UV sterilisers or in bronzing saloons because LEDS are made of plastic( somme parts are) and the UV light breaks down plastic fast.
There are a few exceptions of glass LEDs that cost 300 dollars one small one and that lasts only 1000 hours ,that are true UV LEDs.
But those are curiosityes not really good for practical use.
So any LED cant have more better spectrum than a HID.
The HID has UVB and UVC while the leds dont.
And the substances that are used to glow light are the same in LEDs and HIDs and T5,sodium for yellow,mercury for blue and various otthers.
I now use cob LEDs for grow lamps but they are inferior by far to a HID.
When i used to grow corals ( photosynthetic animals) at home i learned a lot about grow lamps and the strongest growth response to light ive seen was in MH lighted aquarium and second ( my friend) T5HO.
All reef aquariums with LEDs have good growth also but the most sensitive corals were grown with MH and T5HO incomparable better ( from another league).
My friend pays 200 dollars a month only on the electric current from the aquarium lamp and also has to change all the tubes at every 10 months.If Leds were soo good he would have switched to LEDs but he tryed and they failed.
This is the T5HO lamps aquarium.
https://youtu.be/DbDCdHYT-GwYoul never find anything close to this that has grown on LED lamps.
