Mars-Hydro LED Grow Light Discussion

Dear 420 families:circle-of-love:
Because the Chinese National Day:cheertwo: we will have five days off from 30 Sept. to 4 Oct. so we might reply the forum or your email delay:Namaste: if you have an emergency, please call us, phone number under my signature. we will reply you back ASAP:high-five:
 
Nice, I heard that auto plants at least need 8 hours of darkness. 26 days and keep the light 20" that should be OK, hope the plant grow healthy and give you great yields:Namaste:

Amy Gardner said:
Hey Sara - yes, as of tonight it'll be a 14/10 (from 13/11) light/dark cycle. Plant is an auto about 25days old I think (maybe 26). Going super well under the 300. I'm just getting the light lower over these few days as it makes the transition from seedling to veg. Down to about 20" now. Seems ok. .

If I wasn't needing to sleep in here she would have 20/4, but I need sleep too and I'm sure she'll be fine. Is powering right now (will post new pics in a day or so). I have 300w in 2'x2' space, so according to the figures above, I have plenty of light! .


.
Click to expand...
 
SmokeSara said:
Nice, I heard that auto plants at least need 8 hours of darkness. 26 days and keep the light 20" that should be OK, hope the plant grow healthy and give you great yields:Namaste:
Click to expand...

Really, that's interesting. I'd been going on the notion that 20/4 was ideal, and feeling like I might be missing out by not being able to give her more. If they do like 8 hours then my 14/10 cycle seems closer to ok! She's certainly not complaining .
 
Sorry, during flowering plant will need at least 8 hours of darkness, I haven't express clear, I'm not sure whether it is right.

Amy Gardner said:
Really, that's interesting. I'd been going on the notion that 20/4 was ideal, and feeling like I might be missing out by not being able to give her more. If they do like 8 hours then my 14/10 cycle seems closer to ok! She's certainly not complaining .
Click to expand...
 
Mars Hydro COB Par Value Test:cheertwo:
Mars Hydro COB already arrived our USA &AU warehouses, other countries will available soon, Quantities are limited, if anyone needed, hurry up:welcome:
This time we test the par value in our 70cmx70cm grow tent, You might notice that when the COB in the tent with height increase, the par value under the lamp will change a lot, but at the corner, the par value won't have big difference:cheertwo:
Mars Hydro COB Par Value Test - YouTube
 
Hi Celiac, 2x mars pro II 320 are enough for your 4'x8' grow tent 2 scrog plants. May I know what budget on the the light?

Celiac420 said:
I have a 4'x8'x5' gorilla shorty grow tent and interested in which lights you would recommend? I'm going to be doing a scrog style with 2 plants in dwc.
Click to expand...
 
flipped to 12/12 yesterday in the Mars-Hydro Powerhouse

28th_002.jpg
 
I agree :) Enjoy your holiday Vera. You deserve it. Say hello to Lucy and the others from the North-Pole
 
I repaired my spare 320 yesterday. Tell Lucy I will send the broken power supplies as soon as I can afford the postage :) It was a heavy month this time with a lot of bills, and it's 6 power supplies, so it's a heavy package. Guess it's no rush though to figure out what went wrong with them. I promise I will send them as soon as I can - within a couple of weeks.

I do have a question - I friend of mine is in desperate need of a lamp and I do have more lamps than I am using. Because at the level I am growing, you need to always have at least one spare lamp. I have learned that the hard way. But I am over the critical phase of this grow. I doubt something more can go wrong. I mean - I changed so many parts in these lamps, they're as good as new now. So I feel pretty safe loaning away one lamp.

So to the question - I am considering to allow my friend to borrow my Mars Pro Epistar 160 as that would fit perfectly in his very tiny closet. But that also means I would have to put my spare 320 to use while my friend is saving up money for his own lamp. This tent is 70x70x160 - I have a feeling that 800 watt is too much for that tent. Do you think a 320 will work in this tent or will I fry my plants? Not sure I can increase yields much either in such a tiny tent.

I could let him borrow the 320 instead, but I have a feeling we won't be able to fit it in his locker.


So any thoughts?
 
Im reading a somewhat old scientific report that may explain why cob seems to be more efficient than blurple.

Anyone knows about never research than this one from 2009? There are many things indicating that the NASA spectrum we mostly use today is slightly outdated


Abstract

The literature and our present examinations indicate that the intra-leaf light absorption profile is in most cases steeper than the photosynthetic capacity profile. In strong white light, therefore, the quantum yield of photosynthesis would be lower in the upper chloroplasts, located near the illuminated surface, than that in the lower chloroplasts. Because green light can penetrate further into the leaf than red or blue light, in strong white light, any additional green light absorbed by the lower chloroplasts would increase leaf photosynthesis to a greater extent than would additional red or blue light. Based on the assessment of effects of the additional monochromatic light on leaf photosynthesis, we developed the differential quantum yield method that quantifies efficiency of any monochromatic light in white light. Application of this method to sunflower leaves clearly showed that, in moderate to strong white light, green light drove photosynthesis more effectively than red light. The green leaf should have a considerable volume of chloroplasts to accommodate the inefficient carboxylation enzyme, Rubisco, and deliver appropriate light to all the chloroplasts. By using chlorophylls that absorb green light weakly, modifying mesophyll structure and adjusting the Rubisco/chlorophyll ratio, the leaf appears to satisfy two somewhat conflicting requirements: to increase the absorptance of photosynthetically active radiation, and to drive photosynthesis efficiently in all the chloroplasts. We also discuss some serious problems that are caused by neglecting these intra-leaf profiles when estimating whole leaf electron transport rates and assessing photoinhibition by fluorescence techniques.
 
DeVille said:
Im reading a somewhat old scientific report that may explain why cob seems to be more efficient than blurple.

Anyone knows about never research than this one from 2009? There are many things indicating that the NASA spectrum we mostly use today is slightly outdated


Abstract

The literature and our present examinations indicate that the intra-leaf light absorption profile is in most cases steeper than the photosynthetic capacity profile. In strong white light, therefore, the quantum yield of photosynthesis would be lower in the upper chloroplasts, located near the illuminated surface, than that in the lower chloroplasts. Because green light can penetrate further into the leaf than red or blue light, in strong white light, any additional green light absorbed by the lower chloroplasts would increase leaf photosynthesis to a greater extent than would additional red or blue light. Based on the assessment of effects of the additional monochromatic light on leaf photosynthesis, we developed the differential quantum yield method that quantifies efficiency of any monochromatic light in white light. Application of this method to sunflower leaves clearly showed that, in moderate to strong white light, green light drove photosynthesis more effectively than red light. The green leaf should have a considerable volume of chloroplasts to accommodate the inefficient carboxylation enzyme, Rubisco, and deliver appropriate light to all the chloroplasts. By using chlorophylls that absorb green light weakly, modifying mesophyll structure and adjusting the Rubisco/chlorophyll ratio, the leaf appears to satisfy two somewhat conflicting requirements: to increase the absorptance of photosynthetically active radiation, and to drive photosynthesis efficiently in all the chloroplasts. We also discuss some serious problems that are caused by neglecting these intra-leaf profiles when estimating whole leaf electron transport rates and assessing photoinhibition by fluorescence techniques.
Click to expand...

Agree. White light is the way of the future. Just outfitted the whole room with CXA 2530 cree cob and supplemental 5w double chip cabinets. The par on these lights is crazy at 24 inches 1500 plus in the centre. 1200 on the smaller units. The difference is night and day. Canopy is super thick cause it got away from me while dealing with first harvest. These new lights are penetrating through the canopy and to the flood tray it's crazy. Cobs are great 60w driven at 50w continuously the efficiency on these lights are super 1.75 umols/j. The real deal though I think is in QB tech. Cannot beat the 2.4 umol/j. Amare has some pretty cool lights using 10w cobs with the best efficiency available.
 
Yayyyy, waiting to see them all bloom:cheertwo: I doubt that they will need more space when they are in flowering

DeVille said:
flipped to 12/12 yesterday in the Mars-Hydro Powerhouse

28th_002.jpg
Click to expand...
 
Back
Top Bottom