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Yes.

Clones need to harden off mate. You can't just take them from a few watts (or whatever) of cloning lights and put them straight under 500-600PPFD of LED. They need to accumulate chlorophyll first before they can absorb all that light and use it for photosynthesis. If the plant can't...

Sorry, my "short story" is turning into a bit of an epic . . . Back to the OP's problems. I start at about 2/3 strength, or around 1.8-2.0 EC (1.5-1.8 EC plus 0.3-0.4 EC tap water, on average), and go to full strength by about week 2. Every time I water, I have a small amount of runoff –...

I have always used flowering nutrients full run, even in veg. With run-to-waste coco, the plant takes what it needs and the rest gets flushed. Flowering nutrients are always lower in N and generally lower in Ca and Mg. However, I never had an issue with them under HIDs because I had good...

A picture is worth a thousand words. Until then . . . we're all still guessing. Maybe you're frying the seedlings with light – who knows? How are you measuring your PPFD? How many watts of light are you using over what area and at what hang height? If you're using strips I'm guessing you built...

It's really not that hard. Once you wrap your head around the fact that LED produces more light and less heat – and therefore ECs need to be higher alround – you are half-way there. Maintain the correct pH (around 6 in veg +/- 0.3), ensure you have the correct nutrient for growing in Coco (more...

Hahahahahahahahaha! :bigjoint: Ah, I needed a good laugh. I haven't used T5s since 2001. Do any of you guys remember when all the HPS growers back in the day used to say "LEDs are only good for veg!"? Now they're saying LED's not even good for that. And yet . . .

More red – ie 3000K – will veg quicker and will drive all stages of growth faster. The only advatage cool white light with lots of blue in it has is in keeping internodal length a bit shorter, but that can be offset by UVA at the other end of a red spectrum (just like sunlight). EC 1-1.4 is...

Good info. I did find some more recent tests comparing outdoor to indoor grown absorbance and quantum yield, and you are right. However, outdoor grown plants still photosynthesise below 400nm. What is also interesting is how plants grown without UVB respond. I haven't been able to find any...

It has always been widely accepted that the flowering period starts when you flip to the flowering photoperiod, or 12/12. That's the metric most (if not all) seed breeders use. Having said that, plants will start to show pre-flowers when they are sexually mature, anywhere from around 3-6 weeks...

El Dorado OG at almost 5 weeks of flower. This is an 8½-9 week strain. As mentioned, this is not my grow but someone I know.

Lux is never a better option than PAR because PAR will always read true and lux changes wth colour temperature, which itself changes when you increase or decrese the current, as some LEDs perform better than others during current change, so this slightly alters the spectrum. Lux meters are only...

El Dorado OG looking good at about four weeks of flowering. All pretty uniform, although one is an indica leaning pheno (front left) whilst the others are more hybrid/sativa looking. There are four plants in this tent and a fifth one is outside because there wasn't enough room. These are being...

That's cool if you can turn scrap copper into a PCB. We tried a few different PCB manufacturers in China a few years ago and the quality was variable. Most companies couldn't get it right and their PCBs were not perfectly flat, but curled at the edges. The only company that could do it properly...

There are considerations between copper and aluminium that tilt in favour of aluminum. Namely cost – copper is 3-4x as expensive as aluminium – and strength/rigidity – especially for larger PCBs, such as LED panels. There is a simple solution to heat management with 3030 diodes, and that is to...

There is a term called "tolerance stacking" which usually refers to small tolerances adding up to larger tolerances, but in a series circuit it actually has the opposite effect of adding up to smaller tolerances. Confused? OK, let's assume that the voltage tolerances for your individual diodes...

If you're not going to listen to people, then please – don't ask. If what you have is a 56V driver, it WILL work with those boards. The fact HLG assumed it was a 36V driver tells me they gave you the wrong answer – probably by accident. If you were to ask them again – and point out that it is a...

While it's true there will be voltage drop along the trace, the distances are so short that it makes almost no difference. What's more important is to voltage match the LEDs so that those in series have the same voltage drop across each row. That can be the problem with cheap LED PCBs – they...

Which light? We voltage match the diodes on our boarrds to within 0.1V so there is no need for ballast resistors, which hurts efficiency.

That's what it says.