thewinghunter
Active Member
thanks as always!
Ive tried it both ways, and Ill be sticking with my air cooled hoods & ducting. Makes quite a difference. It'd be impossible for me to go without them in my setup.I have two 747 cfm fans. One of them pulls air over 4 1000 watt lights the other sucks air from the room through a filter into my veg room.
I started thinking that instead of running the ducted fans over the lights if I should just move more room air. Shouldn't it all equal out in the end? I'm thinking that moving the lights in the hoods is a bottle neck for the fans and doesn't stop the radiant heat.
Anyone ever measured temps to see how effecting ducted lights actually are?
Im no expert on heat, but I understand what you mean. Reflector heat shields should help reduce some of that radiant heat. There should be some youtube clips regarding these products.Dave,
I am reading on of your other threads about yield. There is an article that says air cooling removes heat at the source. Air cooling removes the hot air in the hood, but does nothing to stop the radiant heat. On a cold day the sun still feels hot on your skin. I'm wondering if everyone is forgetting about this radiant heat.
I decided to look up thermal radiation and came across this wiki page. Of course wiki isn't always the most accurate source, but if Im reading it right, we only see the radiant heat when its really really hot, and most of the time the radiant heat/radiation is in the infrared range, which our plants really dont care much for, so we lose nothing if a reflector heat shield can reduce it.I'm not trying to argue with you, first of all...
If you reduce radiant heat you will also reduce the light. I'm simply thinking there is nothing that can be done. The heat is just part of the spectrum of HID lights. We can't blow it away anymore than we can blow away red light.
I'd be curious to set up a grow tent to actually measure this stuff, just don't have the space right now. Since I don't use CO2 I was thinking it may make more sense to simply move a lot of air in the whole room with the fan that would other wise pull on my lights. I currently do move air in the room and in my lights but have the idea that it may be better to use all my fans to simply move room air.
I'm also wondering how people handle AC when moving a lot of room air, seems like it would defeat the AC. I currently run my AC and pull 747 cfm through a can filter out of the room. I send this to my veg room so the AC isn't fully wasted, but it does blow out of the veg room.
Just trying to understand my environment and not get stuck in the standard way of thinking.
I am currently researching Infrared heat and planning on adding it to my next grow (experimentally) to try and truely recreate the suns rays more exactlyDave,
I am reading on of your other threads about yield. There is an article that says air cooling removes heat at the source. Air cooling removes the hot air in the hood, but does nothing to stop the radiant heat. On a cold day the sun still feels hot on your skin. I'm wondering if everyone is forgetting about this radiant heat.
Don't you have a fan that pulls out all your hot/old air from the room itself? I have an exhaust fan that pulls out all the old/hot air (caused by radiant heat from my hoods) and is replaced by cool air from outside the room.What do you mean the radiant heat needs to be replaced by the exhaust fan ? The exhaust fan on the ducts? That doesn't move radiant heat. Cooling the room with the AC and changing room air remove air heat that gets generated when the radiant heat hits things (plants, walls, etc)
You misread my post. I said you only see the radiant heat when the item is really hot. Like a fireplace poker thats been allowed to sit in the fire for awhile. If you pull it out the iron will be glowing red. At that point we are able to see the radiant heat being emitted.hotwired,
people with sealed rooms commonly run ducted lights... they just pull from outside and vent outside. I actually do the same. I do what you say. I pull from outside split into two, run each line over two lights reconnect the two to one and pull 747 cfm. I pull from outside and vent in my attic. When I feel the air comming off the lights it is cold... About the same as outside air, that is why I am doubting the effectiveness of this. If I can measure the outside air, then measure then output of the lights, I could get a better idea. I think I will do this. The bottom line for me is the air doesn't stop radiant heat.
Dave, I don't think it needs to be 'really hot' to get radiant heat. The hotter the lights the more radiant heat. Also, my lights are 'really hot'. What do you mean by really hot? 100's? 1000's? 10,000s? This term is really ambiguous.