How good are citizen chips?

I’m still toying around with the idea of building a cob light, and the main thing that’s been keeping me from doing it was the 3-400 bucks I would have to spend on cxb3590 chips.

Now I’m looking at these citizen chips and see that I can get 8 of them for a fraction of what I’d spend on cxb3590s and I’m really reconsidering.

I’ve already had people on here tell me that they’ve pulled 1.5gpw with a 500 watt cob light as opposed to around 1 with a 600 watt HPS. These citizen chips suddenly make a diy cob light affordable to me. If they’re decent, I would very much like to build one. Has anyone here had experience with them? If I build a cob light with 8-10 of these citizen chips will it get me a better yield than my 600w HPS

One other question — what’s the deal with these quantum boards? They don’t need a heatsink? Could I just buy a cheap quantum board and a cheap driver for a major veg tent upgrade?

Boards need a heat sink I think above 60w each , maybe double check that on the HLG website.
Some of the smaller boards are designed to run low wattage and no heatsink and come in packs of 4.

Citizen cobs are good, but there are many different ones and some lend better to been run harder than others.
Often the heatsink would cost you more than the COB. There is no reason to use a cxb3590 these days when there are COBs like luminous cxm22 for a fraction of the price.

Thanks. Cobkits.com is the site I was looking at. The heatsinks for the quantum boards aren’t super expensive. Probably better to have one and not need it than need one and not have it. I shot them an email for a little advice on what to buy. The veg light will be the first project because it’s cheaper and simpler, but once I do that I’ll probably feel comfortable building a cob light. All the other parts aren’t a big deal to me. I’ll spend the money for good heatsinks, but what was a huge turn-off for me was the idea of paying $40+ per chip for cxb3590s.