Is 5000k not as good as people say?

DarthPlagueis said:

I converted an old mars hydro to 5000k, using (4) Luxeon G3 1208's by Phillips Lumileds. The PDF is down below

http://www.lumileds.com/uploads/600/DS162-pdf


I thought it would be great for vegging, I have a nice 260w Citizen 3500k DIY build that I have used for flower, but I think it's too much LED for veg. I also want to say I have never vegged with COBs so maybe beginners error, flower no complaints my citi kicks ass.

But so far this Luxeon Mars build has been somewhat disappointing, one plant has grown accustomed to it and has done fine. Others were so bad I just killed them because they looked terrible.

I grow in promix, the Mars actually used to be good in veg, I'd have a little cal/mag probs but nothing crazy, some calimagic would make that go away but since using this Mars hack it's been terrible.

Sprouted 6 plants, 3 I just killed after 2 weeks because they were so yellow it was beyond belief and no growth. One plant actually is doing well at day 26(7 tight nodes at 7"), it shows cal/mag deficiency though but when I feed it, it burns the damn thing.

The leaves on these other two are yellow already(2 weeks), never had these problems before and it's irritating. I can't figure out if it's too much light, cal/mag, the spectrum, or a mositure problem, since this damn thing runs so cool the tent never gets above 70F and the promix just stays wet all the time....

Light is at 36", 100 watts total, 35v*4=140*0.7A=98w

The efficacy of the bulbs is 145l/w so that should be good. Any help would be appreciated, this light should be pretty good on paper, I mean certainly better than the original.

Any help would be nice,

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CobKits said:

why dont you go buy a few $5 2700K A19 bulbs and throw them in there as supplemental? $20 will give you 60W of efficient red

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CobKits said:

why dont you go buy a few $5 2700K A19 bulbs and throw them in there as supplemental? $20 will give you 60W of efficient red

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Photon Flinger said:

Drop your height, they might be getting 50-150 ppfd. keep the temps in range. More red would be better.

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DarthPlagueis said:

I converted an old mars hydro to 5000k, using (4) Luxeon G3 1208's by Phillips Lumileds. The PDF is down below

http://www.lumileds.com/uploads/600/DS162-pdf


I thought it would be great for vegging, I have a nice 260w Citizen 3500k DIY build that I have used for flower, but I think it's too much LED for veg. I also want to say I have never vegged with COBs so maybe beginners error, flower no complaints my citi kicks ass.

But so far this Luxeon Mars build has been somewhat disappointing, one plant has grown accustomed to it and has done fine. Others were so bad I just killed them because they looked terrible.

I grow in promix, the Mars actually used to be good in veg, I'd have a little cal/mag probs but nothing crazy, some calimagic would make that go away but since using this Mars hack it's been terrible.

Sprouted 6 plants, 3 I just killed after 2 weeks because they were so yellow it was beyond belief and no growth. One plant actually is doing well at day 26(7 tight nodes at 7"), it shows cal/mag deficiency though but when I feed it, it burns the damn thing.

The leaves on these other two are yellow already(2 weeks), never had these problems before and it's irritating. I can't figure out if it's too much light, cal/mag, the spectrum, or a mositure problem, since this damn thing runs so cool the tent never gets above 70F and the promix just stays wet all the time....

Light is at 36", 100 watts total, 35v*4=140*0.7A=98w

The efficacy of the bulbs is 145l/w so that should be good. Any help would be appreciated, this light should be pretty good on paper, I mean certainly better than the original.

Any help would be nice,

Click to expand...

DarthPlagueis said:

The leaves on these other two are yellow already(2 weeks), never had these problems before and it's irritating. I can't figure out if it's too much light, cal/mag, the spectrum, or a mositure problem, since this damn thing runs so cool the tent never gets above 70F and the promix just stays wet all the time....

Click to expand...

DarthPlagueis said:

I converted an old mars hydro to 5000k, using (4) Luxeon G3 1208's by Phillips Lumileds. The PDF is down below

http://www.lumileds.com/uploads/600/DS162-pdf


I thought it would be great for vegging, I have a nice 260w Citizen 3500k DIY build that I have used for flower, but I think it's too much LED for veg. I also want to say I have never vegged with COBs so maybe beginners error, flower no complaints my citi kicks ass.

But so far this Luxeon Mars build has been somewhat disappointing, one plant has grown accustomed to it and has done fine. Others were so bad I just killed them because they looked terrible.

I grow in promix, the Mars actually used to be good in veg, I'd have a little cal/mag probs but nothing crazy, some calimagic would make that go away but since using this Mars hack it's been terrible.

Sprouted 6 plants, 3 I just killed after 2 weeks because they were so yellow it was beyond belief and no growth. One plant actually is doing well at day 26(7 tight nodes at 7"), it shows cal/mag deficiency though but when I feed it, it burns the damn thing.

The leaves on these other two are yellow already(2 weeks), never had these problems before and it's irritating. I can't figure out if it's too much light, cal/mag, the spectrum, or a mositure problem, since this damn thing runs so cool the tent never gets above 70F and the promix just stays wet all the time....

Light is at 36", 100 watts total, 35v*4=140*0.7A=98w

The efficacy of the bulbs is 145l/w so that should be good. Any help would be appreciated, this light should be pretty good on paper, I mean certainly better than the original.

Any help would be nice,

Click to expand...

Moflow said:

Any way you can get temps up a tad more? Heat mat maybe?
3 ft from plants to light is much too far away. There will be a massive stretch Imo.
Keep the plants short n squat
Get it lowered to 18"
I've 3 x 23 watt 1212s 3500k on a heatsink bar for 66 watts Total at 16" from plants.

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ttystikk said:

Bingo.

You can't let the soil stay wet, it has to dry out. You're killing your roots, leading to sickly plants that won't grow.

Exactly nothing to do with your light except that you were used to using a much hotter light source and the LED fooled you.

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