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i was reading that 1500ppm co2 is a waste and best is not going over 1200ppm, between 1000 -1100ppm is optimal. You would recommend increasing to 1500ppm and this wil stop the yellowing? I'm still not totally sure it is light burn.

Hi, This is the first time i'm adding CO2 to my grow but i'm seeing some yellowing in the top of my plants, i also added more light, is this beginning signs of light toxicity or some other nutrient deficiency ? At day 25 a start adding CO2 and increased my led strips from 600watt to 780watt...

sorry for my late reply! Yes i build the frame. It's made from aluminium U shaped profile's, dimensions 25mm x 25mm x 25mm and 2mm thick, in the middle just a flat 20mm x 3mm alu strip for firmness and at the ends i used L shaped profile's 25mm x 25mm 3mm thick. At both ends and the middle off...

Thank you @cobshopgrow drivers arrived today! i hooked everything up again today, it's an insane amount of light :mrgreen: :mrgreen: I turned the current and volt screw all the way down, connected everything and turned it on. After that i turned the current fully open en slowly start to open...

Unfortunately the 42AB drivers are delayed en will take a couple more weeks te get delivered. I don't have faith they will be delivered any time soon, it seems like they out of stock everywhere here in europe! I'm thinking about rewiring everything and connect the strips in series but i have no...

i did some more testing. connected the + and - opposing each other but as expected didn't make a difference disconnected 5 strips and connected only 5 to the 480H driver they now max out at 70watt potmeter closed 0% they burn at around 48 watt when i turn the potmeter 15% open they're at 70...

ok tried the d cell battery with the 240H 36B driver and the 4000k strips. They definitely burned brighter, instead of 7,2 watt now it was 28,7 watt, so the 42AB driver will probably be the solution! tried the same driver and battery with the 3000k strips but it didn't make a difference. i...

just to clear things up i connect it like this: 10 X 4000k strips to the 240H 36B driver 20 X 3000k strips to the 480H 36B driver btw 240H 42AB is on its way and will probably arrive next week!

This is what i get: 240H 10 strips 36,37V 4,3A 156,3W 240H 20 strips 36,16V 6,87A 248,4W 480H 10 strips 36,12V 3,74A 135W 480H 20 strips 36,08V 6,57A 237W so only when i connect 20 strips to the 240H driver it gets to full power :confused: Dimmers on both drivers work fine by the way!

so either the meanwell XLG-240-H-AB or the meanwell HLG-240H-42AB will work for the 4000k strips? for the 3000k strips i looked at all the connections again, i don't think the multimeter is the problem, i connected the strips straight to the driver no multimeter and it draw's the same. When i...

Maybe @welight can shine some light on the situation, if the driver is the problem or i need to look at the wiring?

Yes soldered everything! The multimeter/potmeter housing i used wago’s so i Will check this again tomorrow!

This is for the teknik deep red i have the Cree XPG-3 Deep Red, although it’s only a 0,2V difference

Yes! thanks for thinking along everybody! tomorrow i Will reconnect everything maybe i missed something or a wire is damaged! I have a feeling that it has somthing to do with the multimeters!

that sucks i thought the 36b was the right one :wall:

3 pole 100k ohm potmeter from kingbrite. I’m a Little afraid to blow a strip when doing this!

No not joined just open or connected to the potmeter!

This is still my original design didn’t swap a strip! I also marked the places for the screws then pre drilled everything and after that placed the strips and used self drilling screws, twist them hand tight so a screw went through is not possible!

Correct, i find it wierd because i believe you can’t even dim the driver lower then 10% these strips are rated 36v om the cutter web site i believe! Wouldn’t They brake when running on 42v ? https://www.cutter.com.au/product/ssk-1560zge-xx-2835cr/ buying different drivers would suck because i...

I mean for example the second 4000k strip from te bottom, right strip this 405nm diode seems to put out way more light then the other 405nm diode's or is this just illusion? the 20 x 3000k strips have 4x 660nm diode's per strip. Oke maybe i expected too much, i only build cob frame's this is...