How To Choose an LED Grow Light in 2022


Here’s my independent and sponsor-free guide on how to evaluate any LED grow light. This video is NOT about pushing you towards a certain brand or model but instead, giving you the knowledge you need to make your own informed buying decisions.I’ve included some additional notes to supplement the video below. As always, any comments or questions welcome!00:35 00:48 PPFD measurements are dependent on DISTANCE from light source. Some rogue manufacturers and resellers take PPFD unrealistically close to the light and try to pass these off as “PAR” measurements.01:21 BPF is sometimes called PBF by some manufacturers (namely, EYE Hortilux). PBAR definitions can vary slightly.04:21 Arize L1000 600W First Generation Greenhouse Top light (PPR spectrum) manufactured by Current Lighting. US Distributor: Hellion VS3 700W Variable Spectrum LED by Adjust-A-Wings

Hellion VS3 LEDs
06:46 Arize Factor ML900 600W Commercial LED Phantom PHOTOBIO•TX 680W 100-277V S4 and 09:21 Maxibright Daylight 660W LED
DAYLIGHT 660W LED Grow Lights
07:14 SANLight EVO 4 nanoLambda XL-500 nanoLambda XL-500A BLE TELOS MESH

19 thoughts on “How To Choose an LED Grow Light in 2022

  1. blurple lights were not all that bad.i had a mars2 400w panel and the plant under it was killer,cons no spread at all,why i ran half hps half led. all these new leds seem to be spread out now,cant wait to grow again one day

  2. Amazing video, super insightful. Though isn’t ppfd more specific and important? PPF can state output but doesnt say where it’s going so it might just all be in the center instead of evenly spread. PPFD gives a density map of how the PPF is spread out along a 4×4. As shown in the video, it’s more important to check if the corners are evenly distributed. Thus it should be the other way around. If the manufacturer just gives the PPF but has no PPFD map then avoid.

    1. Thanks for your insights Xd. I would argue that PPF comes first—total output—so this is the must-see metric. PPFD maps can be useful for showing the footprint / coverage of the light across a two-dimensional plane at a certain distance from the fixture — it’s just that, if a manufacturer just shows PPFD maps and no PPF, it’s a red flag for me — invariably the distance is much closer than that which is feasible when growing plants in reality — in other words, they measure at 6 – 12″ to show very high PPFD numbers – but the PPF gives all-important context. The other biggie is the spectral distribution. (No point having a super high PPF, or PPFD, if all the light is concentrated in one region of the spectrum.)

      While we are on the subject of PPFD, I would like to add a few more points. We measure PPFD using a PAR meter—typically a handheld meter with a silicon photodiode—housed in an acrylic diffuser cap so that all incoming light is spread homogeneously over the photodiode. The amount of electricity the photodiode produces is then converted into a light intensity reading, in terms of micro moles of PAR light per m2 per second. All good, but—by its very design—a PAR meter doesn’t take into account the direction or column density of the light it receives. For example, notwithstanding the spectral differences, there’s a big difference between the quality of light emitted from a 600W DE-HPS and a 600W multi-array LED—the light origin is spread out over thousands of diodes (typically) with a multi-array LED compared to all coming from the same (relatively small) arc tube with a 600W DE-HPS. My point here is that if you add up the surface area of all those 9mm diodes, it will be 2 to 2.5 times more than the surface area of the arc tube.

      As indoor growers, we’ve been banging on for years about the importance of getting our lights as close as possible to our canopies, without causing localised over-transpiration stress — proximity is arguably even more important for multi-array LEDs. Your plants are the best PAR meters.

  3. I love you videos and the subtle comedy you add. great narration and personality with very detailed info. keep ’em coming!!

  4. more videos on sealed environment as it pertains to co2 enrichment and how to use high levels efficiently. thanks!!

  5. The thing is cannabis need’s UVB light not UVA… They can not really work with UVA but there are only those led’s on the market and they are not cheap, inefficiant and don’t last long… A pure UVB led don’t exist yet, you need bulb’s or so like in a terrarium… (MIGRO show’s a very good UVB light on his channel…)

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