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It is a measurement of the amount of "salts" or nutrients in your feed. I use a Blue Lab truncheon EC meter. The last word on feed strength is the plants or course. They'll tell you if their happy.

Comparing your runoff EC with your feed EC will tell you if your feeding to much. That is one of the things I like about Hempies, good feed back on EC without all the fuss of DWC.

That's pretty simple math! And I agree with it. It's a great way to look at all the mid-power offerings: how hard are they running each diode. I'll check and see where I got off track.:mrgreen: Yes. I found the problem...and it was me. I only counted the diodes on 1 side!:clap:

The way I read his reports, the Vesta would do 2.23 umols/J at .5 watts a chip. That is full test current of 1 amp and 50 watts per 560mm strip! It would do 2.47 umols/J at .25 watts a chip, AND the Vestas have dropped in price to $9.97 for the 560mm strip. I really like the 90cri SPD. I see...

I saw that too. Don't even worry about the lm/watt. There are so many photons outside the narrow lumen curve. The SPDs look like they will be a real performer for plants...especially the 3K and 4K. I am waiting to see more on the Thrive offering and the EB version 3. Bridgelux is being a...

Post 331

https://www.rollitup.org/t/heatsinks-for-diy-led-lamps.851907/ This is an ancient article back when cobs were king. If you look at a u-channel with 1" on all faces, that would be 6" of surface times how long it is to give you total square inches. Supraspl suggested 17 sq./inches for passive...

As in 1" web and 1" flange, so about 6" front and back?

Remember, Cutter actually builds their own boards/strips, and they are smoking busy. So If you're not patient, go with Digikey or Arrow. That said, I ordered 6 of these: https://www.cutter.com.au/product/cutter-3030cree-3k90560/ DHL was $20 something to Alaska. They are worth the wait; for a...

Not talking about you.:mrgreen: And it's not my thread...only a suggestion.

Great thread we have going here. I'm really enjoying the show. If anybody is annoyed, please use the Troll-Be-Gone button...aka the IGNORE button. It's a miracle!

A real gold mine of info there. Thanks for sharing!

You couldn't say it in the 70's and 80's, but I think he had some marijuana plants that were his friends too!:mrgreen:

I am sure you won't make any mistakes in your grow...just happy little accidents!

Got it. Thanks for explaining it...one more time.:mrgreen: I know you have to explain things a lot. Maybe you could point guys like me to a FAQ section on your site. Maybe save you some time.

"...it is widely known in the industry, gonio testing is not really suited for led horticulture lighting." I am not a LED pro, but I'll bite. Why is that true?

Patience grasshopper. Welight is trying to run a profitable business with varying prices and exchange rates...and he's very busy. I ordered 6 strips with DHL shipping to the USA, not express, and it cost $20 something. The 3000K/90CRI strips are great by the way.

beat a dead horse (idiomatic) To persist or continue far beyond any purpose, interest or reason.

You got me on that one! It would be tough to win Party Cup Grow Off and then have to tell them what your "secret sauce" was!

Yes, I should have added plenty of non-horticultural hits for that one...and one-eyed! Thought it might have been some Aussie slang.