Advice on QB288 lm301B

Need some advice before I pull the trigger on buying some QBs.

Is this a good buy:

https://kingbriteled.en.alibaba.com/product/62015981520-810207018/250W_QB288_lm301B_3000K_3500K_sk_bin_mix_660nm_led_grow_light_led_quantum_board.html?spm=a2700.icbuShop.89.5.702a7384XyjLXs

Will 4 of these be enough for a 4 x 8 tent?

How much less heat will this give in comparison to 2 x 600w hps, or gavita DE 1k?

Expected to pay a lot more than $580 for 1000w, am I missing something? Are they old chips/bins or something. I'm trying to do the reading but just going round in circles, any advice appreciated

First they are not true QBs ... they are clone boards. That being said , many have bought direct China / alibaba leds with various feedback both good and bad.

Many like what they got , many argue the “ genuine “ led aspect as many sellers are selling copies of copies and use lesser bin / maker replacements. Also ... think about Returns / Repair . It will cost you to ship back to mainland China . And the communication can be wonky.

If you want TRUE bin quality parts then go to HLG. Or even try Atreum boards.

If you really want to buy , then grab one set then test it , scrutinize it. See if they are worth it after all.

McFrosticles said:

Need some advice before I pull the trigger on buying some QBs.

Is this a good buy:

https://kingbriteled.en.alibaba.com/product/62015981520-810207018/250W_QB288_lm301B_3000K_3500K_sk_bin_mix_660nm_led_grow_light_led_quantum_board.html?spm=a2700.icbuShop.89.5.702a7384XyjLXs

Will 4 of these be enough for a 4 x 8 tent?

How much less heat will this give in comparison to 2 x 600w hps, or gavita DE 1k?

Expected to pay a lot more than $580 for 1000w, am I missing something? Are they old chips/bins or something. I'm trying to do the reading but just going round in circles, any advice appreciated

Click to expand...

If it's sold as a double heatsink set with 2 boards on it for the price, that's a banging deal. I would suggest you get 5 of them for your 4X8.

I believe kingbrite is a good seller/legit, others here can verify.
30-35 watts per square foot is a common recommendation for that type of light, white LED with high efficacy. I'd go with four, with five I'd saw one heat sink in half and spread the boards apart to avoid a hot spot in the middle and give a more even light spread.

Thanks for responses

I bought a bunch of cxb3590s from KB a couple of years ago, was a pretty hassle free transaction and arrived within the week. The only thing that bothered me was none of the cree chips or MW drivers came in any sort of branded packaging or with any paperwork/instructions, I wasn't sure how I'd claim the guarantee they advertised. Due to unforeseen circumstances I had to sell on the lights before flower anyway, but was very impressed by the vegetative growth.

KB quoted me $1200ish for 4 x 250 cxb 3590s so thought I'd look at other options. Does seem a little too good to be true, from what I've read these boards are on par with the COBs but with less deep penetration? I'll be scrogging anyway but don't want to buy twice!

Heat is the only catalyst, my mates had to pull their grows after an unexpectedly hot summer last year so want to be prepared. Otherwise I'd happily go with a couple of 600w hps under a $10 dutch barn reflector lol. Will the cheaper/clone boards run hotter than the QBs? And are they like half as hot as HPS or is it like 15% or something? I know the information is on these forums somewhere but it's painful trying to find it!

I still have 3 HLG-185H-C1400B, 4 heatsinks and 4 cxb3590s. So might just make those up to 4 bars

Penetration comes from well distributed light hitting the plant from many angels and reducing shadowing, not an intense light passing through the leaves and onto the leaves below.

Unless the KB is lying and their board uses less efficient diodes than QB's, heat should be the same as a QB. LED is great if you have heat problems, it can produce the same amount of light as HPS with roughly 60% of the power. Heat is proportional to power, 60% power, 60% heat. LED doesn't heat the plants with infrared like HPS does, so plants under LED like higher air temperature, around 82-84 F.

This chart tells us the corresponding humidity needed.
http://www.just4growers.com/stream/temperature-humidity-and-c02/vapor-pressure-deficit-the-hidden-force-on-your-plants.aspx