Who uses Led for seedlings and clones?

I've had a few problems using my Led with bleaching due to being to close for heat requirements.

In the UK it's not ideal with low temperatures and led but during the summer months or in ideal temperature can the Led be used for seedlings and clones, of course I expect the answer is yes but at what height and power settings would you use for a tray of new seedlings and would it be the same settings for fresh cut clones or would you change the settings ie height or % power or temperature.
Whats your method in as much detail as possible please?

I just did 7 plants from seed with a 430 watt LED (true watts) 24 inches from the plants. When I say from seed, I planted the seeds in soil cups in a propagator, and left them in there for 2.5-3 weeks with the light on full power and a propagator lid (which may have acted as a lens) and never had a problem. In my limited indoor experience, it is much like my outdoor experience. The problem tends to not be the amount of light persay as much as it is the amount of light the plant is used to. When I started these under the LED from the beginning they flourished. If you start something with a much less powerful light or CFLs over a propagator or something just like the sun you have to ease them in a bit more. Maybe start with the light twice as high as recommended and slowly move it down, or dim to 50 percent and slowly turn up. Same thing if you are moving plants outside, you have to adjust them. They get used to what they got, changes is what they don't like rapidly.

With clones, once again for me it is more what light were they under before?
I like starting them, personally seedlings and clones at full power underneath my veg light, then there is no stress as they go into full on veg.

It really depends on the LED...there is a massive range in power and quality. I tried switching to LEDs (from t5s) for seedlings earlier this year and the results were terrible, but I don't blame LEDs in general, just the ones I used as well as user error...probably. There is a learning curve with ANY new light you get. Some LEDs you can keep within an inch of the plant tops, others are so powerful they will bleach your plants within a few feet. I'm not an LED expert, but you will probably need to be specific about a product to get a helpful response here.

Use higher cct for clones, id rec 4000K rather than 3000k. The extra blue helps with transpiration which makes it harder to bleach. Also: you can try using a some heat under the roots, they make waterproof electric blankets.
I think thats the key to @Moflow who is the only one i know who can make cold climate and leds work. Its either that or Voodoo. And im leaning towards the later.

The lights are Samsung LM301H+ Epistar 66nm with 240w meanwell driver.
I've got the 4k model.

A picture is worth a 1000 wordsand there are clones and seeds under a 600,1200 philzon lights as always thank you for your time and the best of luck in all of your endeavors

Never a issue cloning or vegging for me. It gets -40 here in the winter. Clone room has a 4000k 240 kit, veg room a 320 and 240 kit

Star Dog said:

The lights are Samsung LM301H+ Epistar 66nm with 240w meanwell driver.

Eu Stock,2024 Kingbrite P55 240w Samsung Lm301h Evo Led Grow Light Bar For 2 X 2 Ft /80*80cm Tent - Buy Kingbrite Led Grow Light 240w Led Grow Light lm301h Evo kingbrite P55 lm301h Evo Led Grow Light samsung Lm301h Product on Alibaba.com

Eu Stock,2024 Kingbrite P55 240w Samsung Lm301h Evo Led Grow Light Bar For 2 X 2 Ft /80*80cm Tent - Buy Kingbrite Led Grow Light 240w Led Grow Light lm301h Evo kingbrite P55 lm301h Evo Led Grow Light samsung Lm301h Product on Alibaba.com

m.alibaba.com

I've got the 4k model.

Click to expand...

Use the lowest setting and a fair bit of distance. Hard to say cause i dont know how far down this model goes in wattage. 5000 lux or so should be good.

I really like my 315cmh for the small tent. Just the right amount of heat.

What you have @Jeffislovinlife looks more suitable but maybe/hopefully my problem is because they've only ever seen T5s in their lives, I hope so?

I'm using a 1x1mtr atm but my intensions are to move back to my clone tent 3x2 3ft high so getting close is absolutely essential.

Thanks SD

Star Dog said:

The lights are Samsung LM301H+ Epistar 66nm with 240w meanwell driver.

Eu Stock,2024 Kingbrite P55 240w Samsung Lm301h Evo Led Grow Light Bar For 2 X 2 Ft /80*80cm Tent - Buy Kingbrite Led Grow Light 240w Led Grow Light lm301h Evo kingbrite P55 lm301h Evo Led Grow Light samsung Lm301h Product on Alibaba.com

Eu Stock,2024 Kingbrite P55 240w Samsung Lm301h Evo Led Grow Light Bar For 2 X 2 Ft /80*80cm Tent - Buy Kingbrite Led Grow Light 240w Led Grow Light lm301h Evo kingbrite P55 lm301h Evo Led Grow Light samsung Lm301h Product on Alibaba.com

m.alibaba.com

I've got the 4k model.

Click to expand...

Looks like the light has a potentiometer attached on website pics.
Get a kilowatt meter and plug the led into it. Turn the potentiometer down until the kilowatt meter shows around 50 watts.
Place the light around 12" or so away from clones, newly rooted plants.
No point in wasting 240 watts of juice running it full blast when the plants are so small.

Moflow said:

Looks like the light has a potentiometer attached on website pics.
Get a kilowatt meter and plug the led into it. Turn the potentiometer down until the kilowatt meter shows around 50 watts.
Place the light around 12" or so away from clones, newly rooted plants.
No point in wasting 240 watts of juice running it full blast when the plants are so small.

Click to expand...

That exactly sums up my reason for buying it in the 1st place but when I've put anywhere near that low its bleached the plants.
I'm beginning to suspect it's due to the change from soft T5s to the intense light and me not giving them time to acclimatise?

I built a light for my clone tent Secret Jardin P60 60cm x 40cm x 60cm.
I used 4 Samsung SL-B8T3N80LAWW
https://www.arrow.com/en/products/sl-b8t3n80laww/samsung-electronics

To power them 60w total.

I've used it for a year so far and clones root in 6-8 days on most plants.
Cheers
CCG

I had some clones and little ladies under a 120W of COB lighting that did great. Also, I recently ditched my 4' 432 watt T5 for two 110W quantum boards. I experienced light bleaching with a 450W quantum board at full power, so I knew that was way too much for a 5'x5' and the manufacturer didn't know what the fuck they were talking about. At 50% I was able to veg without issue. Tight node spacing and rapid growth was observed. I put the 450W light in my flower room. It was just too much for a nursery in spite of the manufacturer's stupid recommendation. They're in the business of selling lights not growing plants, so it's not shocking they don't know how to properly use the equipment. With that in mind I went shopping for replacement LED lighting for the nursery, but in a more appropriately powered board. Knowing I was able to operate the 450w board at 50% power or about 225w I knew that's the amount of power that would be appropriate for a 5'x5' nursery. I ordered two 110w units off alibaba for $187 delivered. This is the result after about 3 weeks of growth so far:



Notice the tight node spacing and numerous flower sites stacked on top of one another. Absolutely no bleaching. Also notice the boards are mounted to the top frame of the tent as far away from the plants as possible. Not directly on top of them. The results speak for themselves.

This is my clone tote under the 120w COB light. The plants did fantastic and I observed zero light bleaching. I had to place an electric oil filled radiator heater in the nursery to keep temps between 78-81 during lights on and above 75 with lights off. Growth significantly accelerated after placing the heater in the nursery. LED's don't produce much heat especially at 220w. You've really got to keep the temperature close to 80 to keep the ladies happy under the LED boards.