600 watt metal halide distance

osowhom

osowhom

Well-Known Member
I have 2 clones in 1 gallons about 18 inches tall going under the mh to veg I want to keep them short I just topped and am transplanting into 5 gallons tonight how far should the light be for maximum development?
 
Hugo Phurst

Hugo Phurst

Well-Known Member
Got a Lux meter?
If not - put the back of your hand under the light & move it closer until it gets uncomfortably hot, then slowly move your hand away until it's a comfortable warm - that's the minimum distance.

Good luck
 
jondamon

jondamon

Well-Known Member
osowhom said:
I have 2 clones in 1 gallons about 18 inches tall going under the mh to veg I want to keep them short I just topped and am transplanting into 5 gallons tonight how far should the light be for maximum development?
Click to expand...
I keep mine around 12” from the tops with a 400w

For 600w I would say 15”-24” depending upon your ability to control the temperature.7DFAB96C-B760-4807-BE23-B701AC49C8E1.jpeg
 
Star Dog

Star Dog

Well-Known Member
The back of your hand is as good a guide as any imo.

My climate isn't hot but when the sun is shining and it's say 20/25c a thermometer in direct sunlight can hit 30/40c+ so
I set an ambient temperature 25c and a radiated heat temperature back of my hand.
 
jondamon

jondamon

Well-Known Member
Star Dog said:
The back of your hand is as good a guide as any imo.

My climate isn't hot but when the sun is shining and it's say 20/25c a thermometer in direct sunlight can hit 30/40c+ so
I set an ambient temperature 25c and a radiated heat temperature back of my hand.
Click to expand...
Same, my fan speed controller is set to 23C and the sensor is out of direct light amongst the canopy.
 
Star Dog

Star Dog

Well-Known Member
jondamon said:
Same, my fan speed controller is set to 23C and the sensor is out of direct light amongst the canopy.
Click to expand...
Perfect set up imo, that's exactly what they're getting outside on a nice day.

I've got my temperature probe probe hanging at canopy height with a cardboard shade over it to guard against radiated heat.

I wonder how many people are actually measuring the radiated heat from their lights instead of the air temperature.
 
jondamon

jondamon

Well-Known Member
Star Dog said:
Perfect set up imo, that's exactly what they're getting outside on a nice day.

I've got my temperature probe probe hanging at canopy height with a cardboard shade over it to guard against radiated heat.

I wonder how many people are actually measuring the radiated heat from their lights instead of the air temperature.
Click to expand...
Probe is ringed.
It’s position doesn’t change.
D62AE452-73CA-4B68-A7A6-A78BB455DAF9.jpeg
 
osowhom

osowhom

Well-Known Member
This is about good I really was wanting to know how to keep them from stretching during veg but I guess using a net or lst I'm not now or ever supercroppingIMG_20210515_000228388.jpg
 
D

Daffy Dank

Active Member
When i did indoor grows i would hang a simple thermometer at canopy hieght and keep light where temp would average between 78-82'
 
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