light distance

[datwin8]

Is my light too close? 400w

 

[ElfoodStampo]

Is my light too close? 400w

yes.

 

[jacksthc]

Don't know, how high above the plants is the 400w


As a rule of thumb a 400w should be 12" above the plants

 

[datwin8]

yes.

How far should it be?

 

[datwin8]

Don't know, how high above the plants is the 400w


As a rule of thumb a 400w should be 12" above the plants

It's at 14" here

 

[ElfoodStampo]

How far should it be?

put your hand under the light and move it away until you stop feeling ANY heat. Then move it another 8 inches after that, it should be good.

 

[jacksthc]

Well the plants are small in veg so 14" is about right, I would leave the light at that hight for a couple of weeks, let the plant grow 3-4" before lifting the light

you have to more carefull when the plants are young, also plants this small in 2ltr pots can go 5-7 days before watering again, overwatering is the most common mistake new growers make at this stage

 

[Blindnslow]

As young as those plants look I'd run it @ 18-24" above to keep from burning them. Til they get about 8-12" tall then move it to 12" above em for the rest of the time.

 

[datwin8]

put your hand under the light and move it away until you stop feeling ANY heat. Then move it another 8 inches after that, it should be good.

Thanks bro I set it to 24" to be on the safe side

 

[datwin8]

Well the plants are small in veg so 14" is about right, I would leave the light at that hight for a couple of weeks, let the plant grow 3-4" before lifting the light
Yeah, I'm afraid that I May have over watered. I had read that you don't have to fill the pot when the plants are small so I just covered the surface but didn't reach the surface. Or I may have underwatered and the roots are stretching but not getting enough water because I'm not pouring until runoff
you have to more carefull when the plants are young, also plants this small in 2ltr pots can go 5-7 days before watering again, overwatering is the most common mistake new growers make at this stage

 

[scarecrow77]

you want a 400 watt 3 feet from seedlings and lower it as they grow down to 14".any closer and your stressing them...

 

[datwin8]

As young as those plants look I'd run it @ 18-24" above to keep from burning them. Til they get about 8-12" tall then move it to 12" above em for the rest of the time.

Thanks man I did as you said and put it at 24" to be safe

 

[datwin8]

you want a 400 watt 3 feet from seedlings and lower it as they grow down to 14".any closer and your stressing them...

Thanks man for the knowledge I will use it

 

[jacksthc]

Its up to u but if the lights too far above the plants they will strech and become weak, they look like they have 3 sets of leaves so there not seedlings

Good luck

 

[datwin8]

Its up to u but if the lights too far above the plants they will strech and become weak,

Good luck

I think i will just try several distances to see which fits the plant best.

 

[jacksthc]

To help your plants grow quick, you want to use a swamp cooler
as you plants love really high humidty(60-80) ,light and heat ( 33-36c)
In early to mid flower
Low humidty can dry the leaves and do the plants a lot of dammage at this stage

so if you humidity is lower than 40 keeping the light 18" above the canopy would be good
and keep the temp under 30c if you can