600 watt metal halide distance
- Thread starter osowhom
- Start date
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
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
Lucky Luke
Well-Known Member
Leaf temp of about 27C.
IR guns are cheap on ebay.
IR guns are cheap on ebay.
jondamon
Well-Known Member
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.
jondamon
Well-Known Member
Same, my fan speed controller is set to 23C and the sensor is out of direct light amongst the canopy.
Star Dog
Well-Known Member
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
Well-Known Member
jondamon
Well-Known Member
too many to even bare thinking about lol.
Star Dog
Well-Known Member
I've got a mh heat shield that might be worth a look if you want it closer.
2 X REFLECTOR HEAT SHIELD LIGHT SPREADER 250W 400W 600W GROW LAMP BULB HPS MH | eBay
A Heat Shield deflects the heat and light from underneath your lamp so you can position your light closer to your plants. The Heat Shield is supplied with all fittings and easily attaches to your lamp holder.
www.ebay.co.uk
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'
