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Spare a thought for HLG They list a couple of 4 packs on Amazon and voom, they are gone List a couple more 4 packs and voom they are gone again Any cunning sod who really wants them would need to check their listings twice a day Throw some alloy extrusions at them they look nifty doohicky...

Nah, tell them Noah must have taken some seeds on the ark Watch them slip brains into neutral

I recommended one on page 2 post 33 305USD choice of 3500 or 4000 spectrum dimmable from 135 to 285 watts Members recommended heaps of other alternatives also in this thread & in the QB thread

With you seeing the old tech & new tech growing shrubbery side by side in the real world, only the severely brain damaged could think you know less than the lobotomized caveman PMSL

You mistakenly bought the latest 288V2 boards instead of the old 304`s. Sounds good to me

The 3000k & 4000k boards with square diodes & Samsung look like QB288V2 LM301B rectangular diodes are V1 LM561C

get an infrared thermometer, the cheap ones work good enough. Once the seedling recovers from being scorched & grows more leaves you can set the height of light by measuring leaf temp. Keep it less than 27C 80F The china lights do work, just not as well as the good stuff. Leave the "bloom"...

I have no experience with CFL, but they seem good for delicate seedlings. Some LED`s deserve the hype, but most do not. When a light that uses 180 watts is marketed as 600 watts it is code for RUN AWAY. The good manufacturers do not need to exaggerate. I started indoors 18 yrs ago using glass...

lift light up to at least 2 feet, 3 if you have room

This is festering nicely The bloke with the flathead reckons it is as efficient as the injected twin cam Embrace the dark ages & cream your why fruntz

Should ppfd of a light be ignored. Would it be better to discuss how many times a year those inefficient old tech glass tube bulbs need to be replaced & feasibility of using the old bulbs as dildos

plenty of info under QB Project tab at https://horticulturelightinggroup.com/ guides for each of the boards, how to wire them and list of suitable drivers

Meanwell drivers do not come with power cord/plug if bought on their own. If bought as a kit, the seller will supply cord with plug etc. I just bought 2 drivers for future builds from Taiwan with no plugs. 1 will be close to power point so fitted plug to short driver cord. The other will be...

HLG Canada https://www.horticulturelightinggroup.ca/

nah, he spewing. He tried to grow through the winter in tent in cold garage & they didn`t fatten up. They stalled. Told him he pushing shit uphill with a pointed stick & just wasting electricity. i started in 79 & not that silly, no point fighting it.

I have 2 new qb288V2`s in a 2x4 (optimal flowering size) Not fired up yet, another month, waiting for winter to sod off. Gave previous (dismal) 4 cob no name china to mate to assist his 6 cob no name china. He reckoned he saw god when I showed him how bright the qb`s are.

"2.5umoles/joule" = a massive amount of light for sod all electricity cost Easy to upgrade "just the board" in the future when the next upgrade becomes irresistible Mad if he don`t

https://horticulturelightinggroup.com/collections/kits/products/260w-qb-led-kit Recommended Flower Footprint 3x3 sqft or 2x4 sqft

"an infrared thermometer off amazon and monitor your leaf temperatures" with the $ of a real par meter being heaps, this could be a good cheap way of setting height

Mate has one the same. It is all he can afford. He thought it was pretty good, but having now used it, he realizes it is a cheap & nasty steaming pile of faeces. If you can only afford crap, buy crap and be happy like my poverty stricken mate. NOTE: when a seller lists a 300 watt light as 1800...