what barred lights are you using? We've found ways to get a little bit more radiant heat downwards with our LEDS, been keeping the leaf temps fairly decent during the winter months, we've even had some cold spells of late at some of our shops and have not had any issues. we use 301s
HPS vs. LED Grow Lights — Which is Better for Growing Weed?
- Thread starter MarsHydrofactory
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PJ Diaz
Well-Known Member
Mars Hydro. What are your ambient temps without using a heater?
Gregshed
Well-Known Member
Sorry not an argument, most of what he said seems debatable, I wouldn't think changing a bulb a hassle etc.
I own one of their lights they work great, someone likes sodiums well they work too I'm happy just a little taken back they thought to use monochromatic in their take down of HPS.
Heat movement is also a good technique.
PJ Diaz
Well-Known Member
I don't disagree, but at the end of the day this thread is an advertisement, right? I really think they are just trying to talk fancy. To me it's less offensive than saying that a 100watt LED equals the light of a 1k HPS.
Depends, we're up in Canada so it gets cold but temp average between 22 C with fans heats can increase in the room(our rooms also use good insulation). The Mars hydro also have slimmer bars than ours. they only have 3 diodes across where we have 8 across, 452 diodes per bar.
Very Yellow, with an orange tinge
lusidghost
Well-Known Member
I miss that color. It has a 80s Miami vibe. It made me feel like a character on Vice City.
PJ Diaz
Well-Known Member
No matter what bar layout you have it isn't going to change the physics of the spectrum output, and factually LEDs have a steep dropoff past 700nm, compared to a huge IR boost around 830nm in HID, which is going to heat up the leaf temp very effectively despite my low ambient temps (which unfortunately do drop below yours in the cold months). I also have quantum board fixtures where the diodes are all close together, and I don't find that even those throw anywhere near the amount of IR heat which HID does.
Like a late autumn sunset.
Samwell Seed Well
Well-Known Member
Mine are around 70-76 directly under a 4x8 rack...ive def posted photos of the racks in veg...300 watt mars bar with a common temp reader.
Blue brother
Well-Known Member
For me with my Diablos I still struggled with vpd, I moved my intake to the top of the room and dropped the exhaust to just below canopy height, all this really done was stir the air better and make air temps more stable.
I know there is ir coming from my boards cos I can feel it with my hand, however even with their radiant heat from big boards and the convection heat being pulled down towards the canopy, I still wasn’t happy with the vpd, leaf temperature was down, meaning I’d have to drop humidity significantly to maintain vpd OR add a couple fan heaters to blow hot air over the leaves.
My best results while following the vpd chart happen when the air temperature and leaf temperature are within 1c, due to the air temperature and not the leaf temperature being responsible for controlling the rh around the leaves.
I’m not saying I wouldn’t prefer to get the same performance from led as I get from a mix of the 2 but to do this would take a whole lot of tuning time and extra money. I do like the supplemental ir and uv bars from maxibright.
@Drasik what leds do you build? Do you have a site I can browse?
if you’re a beginner I would reccomend starting with led as it does iron out a lot of the beginners mistakes and make life much easier when maintaining environment, plants are also much easier to diagnose under white light.
I didn’t mean to come across as someone slating leds, their benefits are easy to see, the spectrum is amazing and the lack of heat produced from them due to their lower wattage is a godsend in the warmer months. And I’ll ditch the hps once I find a decent source of ir that doesn’t break the bank and can work out their ratios and positioning and wattage to a point where I can keep air temp and leaf temp quite close together.
I also must say though that cmh @ 3200k ish is where I’ve found the perfect spectrum and balance between air temp and leaf temp, I would go as far as to say that plants grown under warmish cmh grow faster, have tighter nodes, yield more and produce a higherquality flower compared to my hlg diablo 350r (new added blue spectrum).
I know there is ir coming from my boards cos I can feel it with my hand, however even with their radiant heat from big boards and the convection heat being pulled down towards the canopy, I still wasn’t happy with the vpd, leaf temperature was down, meaning I’d have to drop humidity significantly to maintain vpd OR add a couple fan heaters to blow hot air over the leaves.
My best results while following the vpd chart happen when the air temperature and leaf temperature are within 1c, due to the air temperature and not the leaf temperature being responsible for controlling the rh around the leaves.
I’m not saying I wouldn’t prefer to get the same performance from led as I get from a mix of the 2 but to do this would take a whole lot of tuning time and extra money. I do like the supplemental ir and uv bars from maxibright.
@Drasik what leds do you build? Do you have a site I can browse?
if you’re a beginner I would reccomend starting with led as it does iron out a lot of the beginners mistakes and make life much easier when maintaining environment, plants are also much easier to diagnose under white light.
I didn’t mean to come across as someone slating leds, their benefits are easy to see, the spectrum is amazing and the lack of heat produced from them due to their lower wattage is a godsend in the warmer months. And I’ll ditch the hps once I find a decent source of ir that doesn’t break the bank and can work out their ratios and positioning and wattage to a point where I can keep air temp and leaf temp quite close together.
I also must say though that cmh @ 3200k ish is where I’ve found the perfect spectrum and balance between air temp and leaf temp, I would go as far as to say that plants grown under warmish cmh grow faster, have tighter nodes, yield more and produce a higherquality flower compared to my hlg diablo 350r (new added blue spectrum).
I have a room of each. I have gavita double ended in one room and switched the other room to the new gavita 1930e. I’m going into my 3rd run with LED. I won’t be switching out my other room. And will give one more run to the leds before pulling half them down and checkerboarding the hps back in. My rooms are sealed and well insulated so I can set temp and humidity wherever I want.
In Michigan the market is crazy bad atm, every little advantage in quality means your packs move when others are sitting. So far I pull better quality from the de hps and the weight isn’t any better under the led. Some strains come out as well or better under the led but not all of em I keep a large variety.
In Michigan the market is crazy bad atm, every little advantage in quality means your packs move when others are sitting. So far I pull better quality from the de hps and the weight isn’t any better under the led. Some strains come out as well or better under the led but not all of em I keep a large variety.
Gregshed
Well-Known Member
I think because it involves money LED salesmen will slander anything but LED and their own lights just to make a buck.
I didn't think HPS that bad or low powered but I don't think LED salesmen need worry since most buy LED these days.
Monochromatic, actually the opposite but please buy Mars Hydro since this guy obviously has three wives, six kids and a mortgage to fund and also I own one.
I didn't think HPS that bad or low powered but I don't think LED salesmen need worry since most buy LED these days.
Monochromatic, actually the opposite but please buy Mars Hydro since this guy obviously has three wives, six kids and a mortgage to fund and also I own one.
Its definitely a cut throat market out there and we're in it now. As a cannabis company first our goal is to make sure the grower in educated in using the LED lights(especially if they are switching) and that we're not BS ppl with our specs and what our light can do.
We've found a new sweet spot with our LEDs, the spectrum control and in sweet soil beds. We've seen actually seen better yields in a few of our genetics which could be attributed to the fact that most of our owns strains were bred and grown outdoor first so they saw that spectral variation from their inception. In the beds with the LEDs we've seen 2-3% increase in overall overall cannabinoid percentages and and overall increase of 1-1.5% in terps. what LEDs are you using?
The gavita 1930e. What were you running before the leds that you saw an increase from? I’ve had a few strains perform better but the majority are not.
PJ Diaz
Well-Known Member
Like I said, I'd rather add a HID lamp in the mix than a heater. I get the heat from the wattage being used, plus the radiant heat from the IR, and the nice byproduct of extra light. I'm not sure why you're trying to poke holes in my system which is proven to work very well for me in the couple of cold months of the year I have to contend with.
I'm a bit confused by your suggestion to "add more power". Are you adding more overall wattage, including more diodes, or are you keeping the diode count the same and pumping more amps through the diodes? Either way your addition of "power" is also going to increase the ambient temps.
To be honest, I see the best quality from a mix of cmh and led, but I don't do it all year because I will have high heat issues most of the time with that setup. My space is very passive in terms of temp control, so I choose to adjust seasonally, rather than implement power consuming temperature control. I have no AC and no heaters. I just adjust to the seasons, and adding CMH to LED in the cold months works perfectly. I've been growing the wedding cake cut for close to two years now, so I have seen how it does under different conditions. It's pretty nice under straight LED, but right now I have it under the mix of CMH and LED, and I'm reminded how much better it comes out in this setup when I check on my plants each day lately, now that I'm past 8-weeks flowering..
xtsho
Well-Known Member
I'm very satisfied with the results I get from my 600 watt Vivosun HID. You can't get that kind of performance with a $150 LED. I don't give a damn about energy consumption. If I were to run LED's in flower I'd end up using more electricity to run a heater than I'd save switching to LED's.
I do have a 100 watt LED in the veg tent in my office now but the plants don't grow any better under the LED than they did under the T5. The T5 covered the entire width of the tent and the top doubled as a heat mat. I'm thinking of putting it back in.
I do have a 100 watt LED in the veg tent in my office now but the plants don't grow any better under the LED than they did under the T5. The T5 covered the entire width of the tent and the top doubled as a heat mat. I'm thinking of putting it back in.