babygro
Well-Known Member
Drying out buds prematurely with Infra-red heat affects how they smoke, not how they look!
About To Start Flowering My Babies
- Thread starter mary jane
- Start date
videoman40
Well-Known Member
While a fan may not effectively reduce all the radiant heat, any co2 in the room will effectively reduce the radiant heat. I guess this would be another good reason for co2 usage than. In spite of the radiant heat, 18 inches is still way too far away. Radiant heat or not.
Peace
Peace
babygro
Well-Known Member
A fan won't reduce any radiated heat.
Are you going to explain now how exactly using Co2 reduces radiant heat?
No it isn't, it's the correct distance. Jorge Cevantes in his book 'Indoor Marijuana Horticulture' actually recommends 24-36 inches for 600 and 1000w bulbs, are you now going to say he's wrong as well?
Claytronics
Well-Known Member
Wow this is a nice arguement. I like it.
babygro
Well-Known Member
If people actually stopped and thought about what the limit of their knowledge is we wouldn't have to keep having these infantile silly little arguments.
People are here hopefully to learn, but some people seem to feel that only their opinion matters sadly.
videoman40
Well-Known Member
Dude, you were questioning if I understood radiant heat, but now it is appearant it is you, that has no idea what radiant heat is, or how it behaves.
Of course co2 will absorb radiant heat, as will the glass installed in your light, assuming that you have one, I know I do.
About 14" is correct for a 1000 watt light.
Peace
Of course co2 will absorb radiant heat, as will the glass installed in your light, assuming that you have one, I know I do.
About 14" is correct for a 1000 watt light.
Peace
babygro
Well-Known Member
You're now trying to tell me co2 absorbs radiant heat and glass absorbs infra red heat?
Do you enjoy making things up to suit yourself?
videoman40
Well-Known Member
Re-read my post and stop changing my words. Ater you've re-read my original post, scroll up and re-read hydroflos post too. He's very wise.
Yes co2 and glass will both absorb radiant heat.
Do your own research.
AGAIN, 14" is about correct for a 1000 watt light, properly cooled.
Peace
Yes co2 and glass will both absorb radiant heat.
Do your own research.
AGAIN, 14" is about correct for a 1000 watt light, properly cooled.
Peace
Moon Shadow
Well-Known Member
gee how far should my 400W MH light be
I'm not sure of the source because I read and watch grow video's
I'm new so I asking not telling it was in my understanding to place hand between light and plants if the hand gets real warm the light is too close
so I have been staying 6 - 8 inches and have been having real good luck with veg too good now i need to cut some of my plant and have and I think I need to cut more
I moved my light 21 inches from plant and now I'm out of room so when it buds I'll have to cut more please help where should my 400W MH be from plant
I'm not sure of the source because I read and watch grow video's
I'm new so I asking not telling it was in my understanding to place hand between light and plants if the hand gets real warm the light is too close
so I have been staying 6 - 8 inches and have been having real good luck with veg too good now i need to cut some of my plant and have and I think I need to cut more
I moved my light 21 inches from plant and now I'm out of room so when it buds I'll have to cut more please help where should my 400W MH be from plant
I have the same amount of plants in what appears to be a smaller space with a 400W in veg. and they appear to be doing great so far... I Only have the light about 18 inches above the plant right now and it appears to be working very well. However this is my first grow so we will see.
pandabear
Well-Known Member
Lets Restart this argument and end it all at the same time.
2. Radiant temperature
Radiant temperature is the result of heat transfer bewteen objects at different temperatures without whats inbetween i.e. the air, being effected. In our case the plants are naturally at a lower temperature that the light and reflector so heat is transferred to the plants foliage from the light/refecltor through radiation. This causes the leaves to heat up. The plants can withstand much higher radiant temperatures (around 40-50degC) than they can air temperatures but if this is too high the plants can 'burn'.
The plants can withstand much higher radiant temperatures than they can air temperatures, but if this is too high the plants can “burn”.
'The hand test': Place your hand in a comfortable position for some time at the tips of your plants should be. If your hand feels “hot”, then the lights are too close, the radiant energy is too intense, and light burn may result. Do this test and raise your HID lights/reflectors periodically to keep light burn to a minimum.
Finally, monitor the conditions in your grow regularly as things are changing all the time, and you will soon get to understand the thermal dynamics of your particular grow space so you can get the most from it.
Editor’s note:
[Cannabis loves high light levels/high radiant energy levels, but exceeding their tolerance for light can result in light burn and chlorophyll leaching out of the leaves. 600's & 1000’s put out a lot of light, and light burn can easily damage clones and young plants.
Light burn damage: initially the leaves look pale green (the edges may turn upwards, mimicking a Mg deficiency), then they turn yellow and finally yellow/brown as the leaves scorch.
Often you can see a circular pattern of intense light where the reflector has focused the light onto the plants. If plants outside of this intense light zone look greener and healthier, consider raising your lights.]
Ill be signing autographs in the lobby
2. Radiant temperature
Radiant temperature is the result of heat transfer bewteen objects at different temperatures without whats inbetween i.e. the air, being effected. In our case the plants are naturally at a lower temperature that the light and reflector so heat is transferred to the plants foliage from the light/refecltor through radiation. This causes the leaves to heat up. The plants can withstand much higher radiant temperatures (around 40-50degC) than they can air temperatures but if this is too high the plants can 'burn'.
The plants can withstand much higher radiant temperatures than they can air temperatures, but if this is too high the plants can “burn”.
'The hand test': Place your hand in a comfortable position for some time at the tips of your plants should be. If your hand feels “hot”, then the lights are too close, the radiant energy is too intense, and light burn may result. Do this test and raise your HID lights/reflectors periodically to keep light burn to a minimum.
Finally, monitor the conditions in your grow regularly as things are changing all the time, and you will soon get to understand the thermal dynamics of your particular grow space so you can get the most from it.
Editor’s note:
[Cannabis loves high light levels/high radiant energy levels, but exceeding their tolerance for light can result in light burn and chlorophyll leaching out of the leaves. 600's & 1000’s put out a lot of light, and light burn can easily damage clones and young plants.
Light burn damage: initially the leaves look pale green (the edges may turn upwards, mimicking a Mg deficiency), then they turn yellow and finally yellow/brown as the leaves scorch.
Often you can see a circular pattern of intense light where the reflector has focused the light onto the plants. If plants outside of this intense light zone look greener and healthier, consider raising your lights.]
Ill be signing autographs in the lobby