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The nice thing about this type of grow is that you can mix in any type of light bulb in order to tweak the spectrum; try adding a little incandesant for flower. Or even a blurple light bulb, theres a few around aliexpress and other outlets.

Do you have a link for that hc 800? Seems like pcb only isnt a very popular sale anymore with meijiu, unless you make a full production run. The new "fotop" is 281b and somewhat slimer, i think about 18cm. Its nice cause you would be able to do higher diode density.

I found that the 301b fotops last a fair bit better than the V1s. We keep them between 150-200w usually.

OP: what lighting have you considered? Hid or led? I feel you on organics but if you chose to grow with leds then it may not be ideal. Leds grow with "cold" light and this means the plants need a bit extra care to climate to transpire properly; without proper transpiration some nutrients...

When you raise light intensity with leda you need to increase temps a bit and most likely add some calmag. Also a good point to read up about vpd/vapour pressure deficit to get your transpiration on point

You realize that you never specified if you wanted 350w total or per board? Fair enough though the answer was made for 320w. This is the thread to learn how to figure this out on your own, together with reading some datasheets so you never have to get the wrong driver again. A little hint, the...

90 cri efficacy boost; are you sure this is legit for growing? As in ppf/w boosted rather than just lum/w? This was the case of bridgelux, they had a fancy new 90 cri spectrum boosting lums but not really the ppf. The P-word: theres not even any consensus what penetration is or how you measure...

We grow in aisles, over 1.10m trays, cannopy is around 1.3-1.4m wide. Im using 300w to cover a 2x4.5 feet space more or less. We wanna use the same drivers that used to cover this space for comparison, its 2x MW xlg150-m so using 8 strips, 2 in series 2 parallel strings per driver. That should...

If you grow in an attic space during winter time and all other houses got snow on the roof except yours, thats a dead give away. I doubt youd be able to see come summer time and not sure about leds vrs hps.

OP: what is your environment like? Did you make adaptions to grow climate when starting to use led? As per previous answers: led lights means missing heat and transporation, most people use around 80-84F to increase drinking. Organics : seems a bit hard to keep them calmag supplied without...

@MidnightSun72 Prawn and GLA have had some problems re cannabinoid testing iirc. Im not sure if someone got busted. Here in Spain all this is easy so it seems like a good solution. It also gives me an indication of how well my china uva does. However i did pick up another 10 strips on top of...

Thtas some very nice lighting. What are these scientific results you talk about?

Why is that a give away? The anthocyanins that are responsible for purple stems/high irradiance response is generally due to a combination of high light intensity combined with low temps. This happens very often in standard spectrum.grows, especially with led not bringing any heat, and usually...

So these just arrived today! @Grow Lights Australia and @Prawn Connery graciously offered these for some testing and i decided to pick up another bunch of them just in case. First impressions: - GLA was really easy and nice to deal with. Always a pleasure to deal with companies born out of...

Those are very expensive but nichia have a very good uv diode. If youre buying in germany you may wanna consider led-tech.de they have a nice offering.

Could you post ola photo of any label on the ballast/driver? The specs are usually there.

What is this higher than 2700k it wont penetrate water deal? It most certainly do; source everything is not black under water (unless you go deeep down). What are you hoping to light?

Do you have a budget and space in mind? Easiest place to start with. Flower light or full cycle? Is this for growing or just standard illumination? Will there be a height restriction? Will you be running this on batteries? If so are you quite sure that your batteries outputs 24V? Or are you...

Im not saying change your soil recipe im saying that you can adjust liquid nutes. This is generally more important when you grow with led than other lights. You seem to have found a good solution for your situation, good on you.

Have you considered whether this might be the problem? From what ive seen ferts in soil isnt the best with leds. Since you do have to make adjustments in environment for transpiration it gets hard to compensate with nutrients when they are already mixed to the soil. If you arrange for...