Distance hps lights....
- Thread starter beelstyle
- Start date
djlifeline
Well-Known Member
a good rule of thumb is speak your hand under the light for couple mins on top of the canopy and when its just warm and your not burning your hand going ouch fuck that hot then it should be alright 
adjust as neccessary if see any negative side effects.
adjust as neccessary if see any negative side effects.wiseguy316
Well-Known Member
about 12 to 14 inches,,just put the back of your hand on top of the plant and if it is too hot for your hand raise the light
NateDizity1420
Active Member
I keep mine anywhere between 12" to 24" usually around 15" most of the time. just make sure they dont burn your hand when your checking distance and that means they wont burn your plants
TaoWolf
Active Member
I like this chart just for reference (even though you'll have to keep an eye on canopy temperature yourself regardless):
View attachment 1272021
View attachment 1272021
tet1953
Well-Known Member
Great chart, TaoWolf. As I thought, 1000w can support a lot of area. Another thought is that the plant will only make use of those extreme lumens up close if everything else is ideal: nutes, CO2, temp, humidity, PH, and other stuff I'm sure. If you don't care about covering max area then I guess it doesn't matter.
Japanfreak
New Member
Here is something you might want to think about for a second.
Look how far away the pros keep their lights.
Look how far away the pros keep their lights.
TaoWolf
Active Member
I'm sure commercial growing concentrates on giving the minimum to the maximum numbers of plants though... Guesstimating those are 1Kw lights at around 30" provides ~5K PAR. Which is the ballpark minimum required for full growth. The benefit is a greater light spread, which equals more plants per light.