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Where are they that price? Is it 150mm - 6" thick? A 4 x 8 x 1" thick sheet celotexgeneral purpose PIR Insulation board is only £17.39...... including VAT

Got any pictures of the light? Is it like an hlg 550 knock off? Any documents come with it, does it not say what spectrum it is.?

Try between low cri 3500K led option and high cri 3000K led. I'm unsure what spectrum your light is but I'm sure it'll be that spectrum range

I use all sorts to make reflective walls. Cardboard wrapped in reflective sheeting, polystyrene sheets, they break easy at edges though, bit of gorrila tape sorts that out. You can cover them with reflective sheeting too. There's also insulated reflective double sided silver bubblewrap that...

Put the lux meter at top of canopy, raise or lower light to get optimum lux reading depending at what stage the plants are, ie seedlings, vegging or flowering. Whats the exact light you have? Does the light have dimmer switch fitted?

Lux to ppfd calculator https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator

RQS WEBSITE: How Much Light Do Your Cannabis Plants Require? Roughly, the lux ranges below are best suited to their corresponding stage of the growing cycle: • Clone and seedling stage: 5,000–7,000 lux • Vegetative stage: 15,000–50,000 lux • Flowering stage: 45,000–65,000 lux

Dunno if this is the stuff you are looking for.....? https://www.desertcart.co.uk/products/13171442-5-pounds-sul-po-mag-0-0-21-5-with-21-sulfur-and-10-5-magnesium-potassium-magnesium-sulfate https://www.amazon.co.uk/dp/B00VJN96LG?tag=picclick02-21&linkCode=osi&th=1&psc=1

Here are 3 Ace Malawi male crossed with the Paradise Seeds Sensi Star original,female - 'Malstar' And 1 Ace Malawi male crossed with Phantom cookies domina fem, - MPCD. There's also a GG#4 S1 jammed in there. ~ 30 days 12/12 4 x 4 tent. ~ 320 watts with an HLG 550R. Temperature cold Two...

Too True.

Is that the name of the led fixture.........?

I change the strength of the light in one of my grow areas. It's amazing how little watts/sq ft is actually needed for vegging. I find as long as they're getting the correct ppfd at the canopy all is well. 4 x 4 tent. My late veg, early flower area It's in a cold garage. Tent is somewhat...

Put them in the microwave, on a plate, cover with cling film. Around 5 mins for an 800 watts.

https://www.rollitup.org/t/cleaning-led-lights.1082579/#post-17164080

Definitely not light stress Looks like Magnesium deficiency

One plant from seed to flower. Or do 'sea of green' method with clones.

That brings back memories. A class act. There's a Rory Gallagher festival held every year in Ballyshannon Ireland and a statue of him in the Town centre.

I agree