400w mh light distance

secretweapon · Oct 5, 2010

i have a 1.5 week old plant(full moon, Nirvana) under a 400w mh in a 3x3x6' grow tent. i have the light set at about 30in away from the top of the plant. temps are holding at 80 degrees, humidity is at 45%.

i did a quick search on the site and found this https://www.rollitup.org/general-marijuana-growing/372808-light-distance-seed-starting-tray.html

smallclosetgrowr said "well it depends on how old the seedlings are , if they have just broken the soil i would keep my 400 about a metre away and move it in closer each week. move the light 16-18 inches away when the plants are around the 2-4 week mark"

my question is about how far away should my light be from my plant, i just want a 2nd opinion. :weed:

LorDeMO · Oct 5, 2010

The general consensus is if you put ur hand just above the plant and if it's too hot for ur hand, then it's too hot for the plant.

Peace.

Humboldt14 · Oct 5, 2010

secretweapon said:
i have a 1.5 week old plant(full moon, Nirvana) under a 400w mh in a 3x3x6' grow tent. i have the light set at about 30in away from the top of the plant. temps are holding at 80 degrees, humidity is at 45%.

i did a quick search on the site and found this https://www.rollitup.org/general-marijuana-growing/372808-light-distance-seed-starting-tray.html

smallclosetgrowr said "well it depends on how old the seedlings are , if they have just broken the soil i would keep my 400 about a metre away and move it in closer each week. move the light 16-18 inches away when the plants are around the 2-4 week mark"

my question is about how far away should my light be from my plant, i just want a 2nd opinion.

when they are young like that you do not want to go by the as long as its not hot on your hand method.

the light needs too be a little higher then norml until they get a little more rooted, i made the mistake b4 with a 600

secretweapon · Oct 6, 2010

Thanks guys for your input bongsmilie

mistaphuck · Oct 6, 2010

I put my 400 watt hps 1 foot from my canopy, any smaller plants just sit below.

tyke1973 · Oct 6, 2010

No matter what the age of the plant be it from clone or seed the light distance is key to getting a good crop,Use yr hand has a gage if it is too warm for your hand it is too warm for the plant.Have a fan blowing across the top of any plant or seedling to take away the heat..............................................tyke......................

Deusracing · Feb 6, 2014

These are mine 4 weeks after planting seed. I had a lot of issues in beginning but have nursed them back to health. I'm just wondering how come i see so many tall plants indic a and mine so far are huge and bushy any help please!!!

400w mh light distance

secretweapon

Active Member

LorDeMO

Active Member

Humboldt14

Well-Known Member

secretweapon

Active Member

mistaphuck

Well-Known Member

tyke1973

Well-Known Member

Deusracing

Well-Known Member

Similar threads