DanKiller
Well-Known Member
Whats your point here exactly
And 90 is nothing, I grow in 30-32c with 60-80 rh all the time, the most rapid growth you'll have.
In flower I lower that to 28c avg.
What would you pick led or hps?
- Thread starter MickyMouseSmokeHouse
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And 90 is nothing, I grow in 30-32c with 60-80 rh all the time, the most rapid growth you'll have.
In flower I lower that to 28c avg.
cdgmoney250
Well-Known Member
I think the main point is that ambient temperature affects the surface temperature of objects as well as any directed heat/light source. A cat may enjoy the warmth of the HID bulb, up to a certain point. Above that point, the cat may become uncomfortable and move.
This is somewhat analogous to leaf temperature. If the leaf temp is raised passed a point of photosynthetic efficiency, due to non photochemical quenching, then overall photosynthesis can begin to diminish. Plants can’t get up and move to a cooler location like a cat can. They have to deal with excessive heat/light/drought through physiological means. This results in more plant energy being put into reducing photoinhibition. When we are paying energy bills to optimize the environment of an indoor grow, this scenario can become counterproductive.
This is somewhat analogous to leaf temperature. If the leaf temp is raised passed a point of photosynthetic efficiency, due to non photochemical quenching, then overall photosynthesis can begin to diminish. Plants can’t get up and move to a cooler location like a cat can. They have to deal with excessive heat/light/drought through physiological means. This results in more plant energy being put into reducing photoinhibition. When we are paying energy bills to optimize the environment of an indoor grow, this scenario can become counterproductive.
Beeswings
Well-Known Member
The point is the cat will only prefer the hid light under certain conditions, just a the plant will.
tstick
Well-Known Member
Have you ever tried to pick up a cat that has been sleeping in a bright sunbeam for awhile? They just melt! 
Anyway....yeah plants will grow under LEDs or HIDs just fine. I have no science to back it up. I'm just saying that, after growing for a long while, I believe that the plants "like" (whatever that means) the light coming from a warm bulb in a directional way. But, most of the time, I use LEDs to grow because I believe they are safer.
Anyway....yeah plants will grow under LEDs or HIDs just fine. I have no science to back it up. I'm just saying that, after growing for a long while, I believe that the plants "like" (whatever that means) the light coming from a warm bulb in a directional way. But, most of the time, I use LEDs to grow because I believe they are safer.
Beeswings
Well-Known Member
I'm more of a dog guy myself lol. The white one loves to lay out in the sun, the brown one prefers heat but shade, the black one is all about the coolness and the shade. The white and and black will break through frozen water to retrieve a duck though and be very excited about it.Have you ever tried to pick up a cat that has been sleeping in a bright sunbeam for awhile? They just melt!
Anyway....yeah plants will grow under LEDs or HIDs just fine. I have no science to back it up. I'm just saying that, after growing for a long while, I believe that the plants "like" (whatever that means) the light coming from a warm bulb in a directional way. But, most of the time, I use LEDs to grow because I believe they are safer.
DanKiller
Well-Known Member
Cool, so in std growing conditions, not extreme (although like we said, 90 is not that extreme if any) the cat/plant will prefer the more complete light.
This is just another smoking gun, a nice little touch on many more evidence and aspects in the leds vs mostly anything else
The literature and the studies is out there for everyone to see it's not hidden.
At the end, everyone is entitled to choose and pick what suit them the best.
We just share information.
Happy growing and those are some nice dogs @Beeswings !
Beeswings
Well-Known Member
Honestly I'm in Minnesota and hope the growing regulations get more loose so I can utilize more growing techniques, right now I use the sun, LEDs and florescent tube. I'd like to try so many more variables with so many more plants.
Potheadbloke
Member
Depends what n where u live if the temps are high hps will be too much hard work and load LEDs are lower heat and. Perfect lumens all year round they have a spectrum of light Which covers a lot more
Jonesfamily7715
Well-Known Member
Led efficiency is very dependant on ambient temperature as well these companies data is based on perfect conditions, this chart is from the lm301h datasheet, remember they are talking about the solder junction point temperature not ambient the actual diodes are higher temp than your room in almost every case.
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Jonesfamily7715
Well-Known Member
Hid's especially de bulbs do very well no matter how hot things get you'll roast the plant long before you lose efficiency
Greengrouch
Well-Known Member
In a 7x2 I’d go with 2 long style leds around 300w each. Mars lights are solid for the money, 2 tsl 2000s or sp3000s would do the trick
amneziaHaze
Well-Known Member
LEDS less power more yield less temperature longer lifespan higher thc
www.scirp.org
my attis 300W has a 2.7µmol/J best hps has 1.7 and hps just shoots all its light down the middle its soo hot you cant use it soo you have to put it away.attis has 12 light bars spread in every corner of the room making the light uniformal as possible only the edges of the room get lower light
Photosynthetic Performance and Potency of <i>Cannabis sativa</i> L. Grown under LED and HPS Illumination
Light-emitting diodes (LEDs) can be used as an energy efficient alternative to high-pressure sodium (HPS), which have historically been the standard for supplemental lighting in cannabis cultivation. However, there is a lack of scientific understanding in the cannabis industry regarding plant...
my attis 300W has a 2.7µmol/J best hps has 1.7 and hps just shoots all its light down the middle its soo hot you cant use it soo you have to put it away.attis has 12 light bars spread in every corner of the room making the light uniformal as possible only the edges of the room get lower light
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