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CMH vs LED vs HPS
- Thread starter Gerardbutler79
- Start date
I have harvested my first run under LEDs after many years with HPS, I had trouble to keep the temperatures high enough for the plants to give all their potential. I made 380g with a Lumatek Zeus of 465w, it was used first at 25% then to 100%, on this run the yield is the same I had with 600w HPS so it's more effective even if it's possible to do better with the LED I have. The quality however is really nice, the smell and taste are very powerful and the high is very satisfying and long lasting.
I think the plants are more leafy under LED but as they are full of resin it's perfect to make some Haschich. The trim was fresh frozen to avoid to get pieces of dry leaves with the trichomes, this run of ice o made a fantastic result, I got 7g but I don't know how much plant material was used. I think around 70/80g of dry material.
After one run I can't yet judge if the LED are really better than the HPS but so far I'm happy to have switch and the next months who will get warmer it will really helpful to have a light source who don't produce heat.
I think the plants are more leafy under LED but as they are full of resin it's perfect to make some Haschich. The trim was fresh frozen to avoid to get pieces of dry leaves with the trichomes, this run of ice o made a fantastic result, I got 7g but I don't know how much plant material was used. I think around 70/80g of dry material.
After one run I can't yet judge if the LED are really better than the HPS but so far I'm happy to have switch and the next months who will get warmer it will really helpful to have a light source who don't produce heat.
exoticrobotic
Well-known member
I used the maxibright led which i think is basically the same as the lumatek one... Mostly white leds with a few red leds.
Did you run the same plants under the HPS too?
It would be interesting to evaluate any differences in the high there might be.
Here is an interesting article on light spectrum and cannabinoids.
Very interesting but It's a 3 coffee/3 spliff article
Perfect now you have 7g of hash
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8389281/
goingrey
Well-known member
Whew this study is difficult to follow with their "L1 L2 L3 on the other hand on the other hand" and THC and THCA somehow being produced better in different environments, how does that even work..I used the maxibright led which i think is basically the same as the lumatek one... Mostly white leds with a few red leds.
Did you run the same plants under the HPS too?
It would be interesting to evaluate any differences in the high there might be.
Here is an interesting article on light spectrum and cannabinoids.
Very interesting but It's a 3 coffee/3 spliff article
Perfect now you have 7g of hash
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8389281/
You might be right about those three coffees and spliffs, only had one coffee and no spliff. Or then this is just a bunch of fancy words that provides no real insight.
exoticrobotic
Well-known member
3 coffees, 3 spliffs and 3 open tabs for that 1 article and i'm none the wiser
It's hard to draw a conclusion apart from different led light spectrum ratios greatly affected Hemp's chemical constituents/pathways.
I read that green light is important for CBD and that some of the spectrums tested caused more THCA and CBDA vs THC and CBD.
What is clear from the article is that everything is unclear
It's hard to draw a conclusion apart from different led light spectrum ratios greatly affected Hemp's chemical constituents/pathways.
I read that green light is important for CBD and that some of the spectrums tested caused more THCA and CBDA vs THC and CBD.
What is clear from the article is that everything is unclear
comfy markoth
Well-known member
I'm going to get a CMH just because it sounds fancy, and should compliment a couple of mars LEDs.
Brother Nature
Well-known member
Reflected spectrum already looks very different... 1-3 weeks from harvest on these girls. One CMH 315w 3200k & two 112 mixed spectrum LEDS (660nm, 3500k, 5000k). Addition of CMH to the previously all LED grow is necessary in the cooler winter months here. Raises temps, but reduces RH to the point where VPD is more controllable than in LED only setups, just need to add heating at night to keep the RH levels under control.
I think mixing LED and HPS or CMH is the way to go in winter when the temperatures are too low with LED only set-up, I know you can use heating pad under the pots to keep the roots hot enough but if I have to use energy I prefer to use it for additional lightning and heat instead of just heat.
On my first LED run I used a HPS dimmed at 250w for a few hours and the plants next to it made the best yield of the grow and the further ones made the lowest yield. The difference between the plants who had enough heat and the one lacking was huge, the big ones made around 70g and the smallest only 25g.
On my current run I have not used the HPS to raise the temps as it is a bit warmer now but I can see at least 2 plants who would need a bit more degrees to really thrive. I want to see how the set-up can perform without additional energy, it should produce about the same yield as my previous run or a bit more as the temps are bit higher with the LED only. I'm curious to see how this set-up will do in summer when the ambiant temps can be over 30°c.
For now my veg space is still set-up with HPS/MH light, I was a bit worried about transitioning plants from HPS to LED but they did not mind and are really loving the new light spectrum. I'll change the veg light next month I think to avoid the usual problems I have in spring/summer.
On my first LED run I used a HPS dimmed at 250w for a few hours and the plants next to it made the best yield of the grow and the further ones made the lowest yield. The difference between the plants who had enough heat and the one lacking was huge, the big ones made around 70g and the smallest only 25g.
On my current run I have not used the HPS to raise the temps as it is a bit warmer now but I can see at least 2 plants who would need a bit more degrees to really thrive. I want to see how the set-up can perform without additional energy, it should produce about the same yield as my previous run or a bit more as the temps are bit higher with the LED only. I'm curious to see how this set-up will do in summer when the ambiant temps can be over 30°c.
For now my veg space is still set-up with HPS/MH light, I was a bit worried about transitioning plants from HPS to LED but they did not mind and are really loving the new light spectrum. I'll change the veg light next month I think to avoid the usual problems I have in spring/summer.
Anyone has tried our smart lights? Do you have any suggestions for the smart light system? How it should be? Or what it will be? Feel free to share your idea.
www.mars-hydro.com
Smart Grow System | Mars Hydro
Mars Hydro smart grow system lauched to start the fully automated cultivation, including smart LED grow lights, programmed ventilation, operation triggers, data logging and remote control via mobile devices.
www.mars-hydro.com
Corpselover Fat
Active member
Maybe it's not always possible, but reducing heat loss is also an option. Leds produce about 2/3 of the heat HID does so it's not really that much less. It's just much easier to vent out the heat.
exoticrobotic
Well-known member
In winter and in spring i find hids are the best way to produce anything.
Leds just dont work well for me in these low temperatures, everything slows down and all manner of issues pop up when it's 11 C outside and you are growing in an unheated/uninsulated environment.
I could mix led with hps/cmh but why bother when the extra heat is needed?
I could spend more $$$ on kingspan/celotex but why bother when the hids provide enough heat?
Leds work well in summer and can be welcomed when the extra heat hids pump out tip the grow room to well over 33 C but in the colder months, running hids at night means i dont need to insulate the grow tent.
Some programmable spectrums would be good. Maybe a program or two to replicate an autumn fade over the last few weeks of flowering by changing red/yellow/blue/green ratios etc.
Ganj on
I'm interested in trying LED eventually. But CMH fixtures are dirt cheap on eBay and other online markets now. Largely because people want to move on to LED. I bought 2 315 vertical fixtures with Philips bulbs for $100 incl shipping. Hell, I don't think I can get close to that value with LED; and I know what CMH will do, no learning curve for me.
exoticrobotic
Well-known member
That is cheap.
600W combined cmh and hps raise my 4x4x4 tent's canopy temperature from 11C to 20C which the plants like. I dont see any nute lockouts/deficiencies.
cmh adds extra resin, terps and pysychoactivity, at the expense of yield vs led but imo the end product's potency with a cmh grow is far superior to any other light i've tried.
600W combined cmh and hps raise my 4x4x4 tent's canopy temperature from 11C to 20C which the plants like. I dont see any nute lockouts/deficiencies.
cmh adds extra resin, terps and pysychoactivity, at the expense of yield vs led but imo the end product's potency with a cmh grow is far superior to any other light i've tried.
exoticrobotic
Well-known member
I tried 300w maxibright led panel in summer and was surprised by the increase in flower size.
It was good but the cmh bud had more oomph.
exoticrobotic
Well-known member
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exoticrobotic
Well-known member
I'm tempted to hang a flouro bulb vertically under the canopy to beef up the lower buds.
I got really nice quality buds from flouro tube grows.
I honestly can't afford an equivalent LED fixture. No joking.Lucky for you bud, that learning curve could bankrupt you
I've considered that in the past. I use pll 55 watt fixtures for seedlings and early veg. I like those lights.
I guess you are just lucky
