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Led Vs. Hps - 70w Challenge
- Thread starter Medved
- Start date
The Predator
New member
to stari, vidva sta res đeka
i'm down with leds, in my eyes this is just a formality, we've been telling people for years now, it's time to show them...
right on
i'm down with leds, in my eyes this is just a formality, we've been telling people for years now, it's time to show them...
right on
icough2getoff
Active member
cool experiment! I'm gonna watch this one
pumpkin2006
Member
With a well done scrog, I think the overall yield will be better on the LED's. They have a very even light distribution and are at the peak wave lengths of chlorophyll A & B production. The hps will yield some plants with more but the overall yield will be less. The hps doesn't have the right spectrum and doesn't have an even footprint.
pumpkin2006
Member
TheMaskedFarmer said:
The reason you've seen that is because in the 600-700 nm range Chlorophyll A&B will cause more stretch, where as in the 400-470 nm range it will cause them to be shorter and stocky, the key is making a balance between the two. More often then not, I've seen LED grows with 80% or more red LED's.
LED_experiments
Member
Medved mentioned what leds are used
400: 25°, 40mW/sr
465: 18°, 11cd typ
630: 20°, 14cd typ
660: 30°, 4cd typ
the number of each led ratio used here is 1:1:4:4 in the order that are written above. in my previous test lamp (greg's) i used 470 and 630 in 1:4 ratio and there was no unnecesary stretching. all the tests that i ran with my lamps, there was allways minimal internode spacing, little bushy plants with healthy dark green coloured leaves. but my lamp with this combination hasn't been tested yet. i don't grow (any more), i just make the lamps and receive the feedback informations about the growth.
the predator: pozdravljen
400: 25°, 40mW/sr
465: 18°, 11cd typ
630: 20°, 14cd typ
660: 30°, 4cd typ
the number of each led ratio used here is 1:1:4:4 in the order that are written above. in my previous test lamp (greg's) i used 470 and 630 in 1:4 ratio and there was no unnecesary stretching. all the tests that i ran with my lamps, there was allways minimal internode spacing, little bushy plants with healthy dark green coloured leaves. but my lamp with this combination hasn't been tested yet. i don't grow (any more), i just make the lamps and receive the feedback informations about the growth.
the predator: pozdravljen
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Jimmy_Shelter
Member
Absoultely fantastic!!! i assume the led's make no heat ? gonna be watching this one to the end
Mr_Micro
Member
Jimmy_Shelter said:
I've been wondering about this one too! I know it's almost impossible to generate a decent ammount of light without creating some ammount of heat as a biproduct, but I've never seen anyone mention exactly how much heat LEDs give off.
I considered trying to get a custom array of LEDs made for a PC case growbox but I ended up opting out for CFLs insetad since I couldn't formulate a guess on how much heat the LED array would generate.
Any thoughts on this one Medved or LED_experiments?
plz put your hps light closer, its too far away!
good to see a comparison thread at last too!
good to see a comparison thread at last too!
pumpkin2006
Member
The thing about LED's is that they really don't put off any heat. Thats why they are so efficient. You can easily put your finger on an LED and never really feel the heat. Honestly you probably need a heater to keep the temps right.
I know nothing of LEDs but would it not be better to use a kinda of reflective surface ermmm making a led array?
I hope the leds out perform the hps, because really leds are so power efficient they are the way of the future. If somebody shows that they can work just as good, more people will use them and info comes in.
But in reality I think the hps will out perform the leds. Atleast untill you find the right combination of wavelengths.
Good luck.
I hope the leds out perform the hps, because really leds are so power efficient they are the way of the future. If somebody shows that they can work just as good, more people will use them and info comes in.
But in reality I think the hps will out perform the leds. Atleast untill you find the right combination of wavelengths.
Good luck.
pumpkin2006
Member
If you wanna know, then all you need to do is ask:
LED_experiments
Member
ok, let me answer your question
Mr_Micro: there is no need to be affraid about the heat. i never really measured that, but i think the temperature of the bulb is arround 20-30°C (they say operating temperature should be 27°C inside the pn-junction, so it should be lower at the top of the bulb). i tested one of my lamps and i put it to that height, that leaves were always touching the bulbs. there were no burns anywhere.
about reflection: the leds emmit very direct light (as you mentioned), so the reflection background is not really necessary.
Mr_Micro: there is no need to be affraid about the heat. i never really measured that, but i think the temperature of the bulb is arround 20-30°C (they say operating temperature should be 27°C inside the pn-junction, so it should be lower at the top of the bulb). i tested one of my lamps and i put it to that height, that leaves were always touching the bulbs. there were no burns anywhere.
about reflection: the leds emmit very direct light (as you mentioned), so the reflection background is not really necessary.
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S
stonedeconomist
just saw this thread and subscribed. this is going to be great, i've been wanting to see a side by side grow comparison like this one. 
while we're watching this grow, if anyone is interested in seeing some complete led grows, davidzap did a couple of really nice led grow diaries over on uk420. his first one was an led/cfl combo grow which gave him a pretty good plant. the second on was an all led lowryder grow which wasn't as productive as he wanted but he said the nugs were tight and smoked real well. he grew one plant at a time and didn't scrog light medved is doing which allowed him to aim his comercially bought led grow lights at specific parts of the plants.. both davidzaps diaries are filled with info on led growing. a lot of folks like ledexperiments stopped buy and contributed to those threads.
while we're watching this grow, if anyone is interested in seeing some complete led grows, davidzap did a couple of really nice led grow diaries over on uk420. his first one was an led/cfl combo grow which gave him a pretty good plant. the second on was an all led lowryder grow which wasn't as productive as he wanted but he said the nugs were tight and smoked real well. he grew one plant at a time and didn't scrog light medved is doing which allowed him to aim his comercially bought led grow lights at specific parts of the plants.. both davidzaps diaries are filled with info on led growing. a lot of folks like ledexperiments stopped buy and contributed to those threads.
