(Actual) 600W COB LED grow light. Minimum space needed to grow? Can I take the lens off to lower the intensity? It seems like the lens focus the light more

I doubt very much that's too strong. I used nothing but 600w lights for over 20yrs in a number of different set ups including closets but you don't have to guess nowadays.Theres a free light metre app for your phone.PPFD Metre.They can take 1000umols but I aim for around 600 during veg.700 for the first 2wks of flower.900 wks 3 to 6 then turn it down after wk 6 as it helps to preserve the terpenes. Depending on how high you hang it I doubt it will be more than 900 which the plant can handle fine.They aren't autos are they?Autos are more sensitive. Iv just noticed it has switches veg and bloom so I guess that will be ideal for that area. I bet veg is no more than 700umols.It may not be 640.My creecobs which are the best are 50w.Use the light metre.

It would take a closer look in a white light...but to me it looks like a lack of nitrogen. Are they in veg or flowering? Those yellow new growths may indicate nitogen deficiency. Your plants don't look light burnt. Hope this helps!

Your plants don't appear burnt to me- light, nutrient or otherwise. The one has some paling in new growth but I don't think that's light related. Your light will only be running at full capacity when both veg and bloom switches are on. Those are your dim options. Veg is about 350w, bloom is like 305w and combined you get the full 655 or whatever. You shouldn't have to hang it 4+ feet above the canopy, from what I'm finding the recommended hang height is about 24 inches. Even with a 600w HPS you're generally hanging no more than 24 inches above canopy, generally closer to 16-18 inches by late flower. Really COB lights aren't the best option out there. The larger bar style lights have better coverage and can typically be hung closer to your plants.

Sorry to say that light is poorly designed. Way too much light in a small frame. Yes, in this case removing the lenses might help greatly. You'll get a much wider beam angle, so it'll spread out more. Even so, you may need to dim the light from any normal hanging distance. It's only 21" x 17" and excpects to cover 4.5' x 5' -- light needs to spread out 2' or more from the edge of the light frame in all direction. Thatwill require a very high hanging distance, not unlike a 600w HPS bulb. That's gonna require some trial and error. It's proportional to hours of operation, so if youfind something that works for 18hours vege, you merely have to amp up 150% power from there for 12 hour operation. if you figure it out in flower phase (12 hour operation), that's fine too. You'll need 2/3rds of tht power for 18hour operation. i'm surprised 4.5 ft hanging distance is still too much. something like a photone app can help, but you still need to observe and adjust based on plant growth -- too tight, reduce light. too lanky, increase light. But, you can use that free app to set the intiial "hotspot" directly under the light to roughly 40 DLI at canopy level, then have a much smaller/faster adjustment period. This will not tell you exactly where to hang it. you still have to observe growth and adjust, but at this point it should be within a few inches of where it needs to be. if i flower work with 100% power. If in vege work with 67% power. This way you use same hanging distance in 12h and 18h operation.

Get a little 100w light with a dimmer for seedlings

I would be hard pressed to imagine a circumstance where your LED lights are too powerful for the grow. This light I would have running a 3x3 at like 2 feet or right below for flower, add a foot for veg, add another foot for seedlings. Make sure you're using VEG versus BLOOM. Would be interested in how the fixture responded to you messing with the power supply like BudMunchies said

Plant looks more like burned from over feeding, not light burn. Google tells me the coverage is 4.5 X 4.5 feet, hanging height is between 2 and 3 feet depending on plant stage of life.

Hi, hier ein kleiner tip, ich nutze die App Photone um meine Lampen richtig einzustellen. Sie ist zwar nicht 100% aber sie hilft dir Aufjedenfall. Richte dich nach diesen Werten und Mess an dem Blätter dach Keimlingsphase: In dieser Phase benötigen die Pflanzen weniger Lichtintensität, etwa 100–300 µmol/m²/s, um ein gesundes Wachstum zu fördern, ohne die jungen Pflanzen zu überfordern. Vegetative Phase: Hier steigt der Lichtbedarf auf 400–600 µmol/m²/s, da die Pflanzen mehr Energie für das Blattwachstum und die Entwicklung benötigen. Blütephase: Während der Blütephase wird eine höhere Lichtintensität von 600–900 µmol/m²/s empfohlen, um die Blütenproduktion zu maximieren. Es ist wichtig, die Lichtintensität schrittweise zu erhöhen und sicherzustellen, dass die Pflanzen nicht unter Lichtstress leiden.

That light is definitely overpowered for a small closet grow, and since it doesn’t have a built-in dimmer, your options are pretty limited. Raising it higher clearly isn’t working, and at 640 true watts, it’s pushing way more intensity than your plants can handle. The best fix for this is to get a power dimming plug or a voltage regulator. These devices plug in between your light and the power outlet, allowing you to manually reduce the wattage. Since your light doesn’t have onboard dimming, this is the easiest way to control output without having to buy a whole new fixture. Look for one rated for at least 650W to handle the load safely. If you don’t go that route, the only other real solutions are moving to a larger grow space where the light can spread out properly or switching to a lower-wattage LED that’s better suited for a closet setup. But if you want to keep using this light, a dimming plug is the quickest and cheapest way to make it work without torching your plants.

plants don't look to burned??? To strong of light will cause inter node spacing to be tight and compact with little to no branching. IDK if i am seeing this? but hard to tell with just overhead shots and no side shots.