Cobs are great yes but for a small space any PCB board light is gonna be far superior as it checks off all the boxes for a pc like build space.
Its lower heat issues than a cob because the diodes are spaced out accross the strip instead of in one giant cluster like a cob. For heat issues with a cob you see that pin heatsink on that pic, signifigantly reduces the height of your space with it. With the strip just mount it to top of the case, the aluminum of the case itself should be more than adequate for heatsink. These strips are the new cutting edge thing, they feature diodes that are top notch in every aspect i have 16 twofoot long samsung H strips running 700mA pulling 320watts from the wall, the thing is badass and i can flower a 2x3 foot closet with it to the point of it being more worried about too much light than not enough. If someone is buying those e27 lights and disassemblign them for the board and driver to mount in a case, these strips are soooooo superior its just silly.
If youve seen the excitement about quantum boards, the samsung h strips are essential the same thing. Its the same 561c diodes on a strip manufactured by samsung themselves instead of HLG buying the diodes and putting them on a PCB in their own configuration. The bridgelux EB strips are of the same quality, not quite as good but less expensive.
If you look thru the bridgelux EB build thread in the led section that jelly already linked thats 40+ pages long of info. There are multiple many other threads in the led section about these strips.
Im shocked cab growers arent more aware of these suckers and jumping all over them. Its the *perfect* small space growing light. One two foot length can be had for under $10 but then youd need to buy a driver for it and the stuff to wire it, just like you would if you bought a cob.