Distance between 600 w HPS bulb and top of cola

[ISK]

How much distance would you keep between a 600 watt HPS bulb and the top of the plant?

I recently bought a 315w CMh and the salesman told me to keep it about 18 inches away from the plant, which seems high, but I have confirmed that 16 to 20 inches is normal for LEC

I keep my 600 watt HPS about 10 inches away, which he thought that was too close....what's your opinion?

cheers
ISK

 

[boilingoil]

Too close for an open reflector for me 18" for 600 watts and it really depends on your grow area size.

 

[MichiganMedGrower]

I have my 600’s in sun system blockbuster glass enclosed air cooled hoods and see leaf stress at the canopy at about 18” or closer.

 

[boilingoil]

How have you and the misses been doing there MMG.

 

[MichiganMedGrower]

How have you and the misses been doing there MMG.

Hey bud. What’s up?

We are ok. Unfortunately Mrs. MMG’s father is sick with bad cancer. She went to Colorado last month to see him. At least he is back home and not still in the hospital.

Has your crowded busy life calmed down?

 

[boilingoil]

Hey bud. What’s up?

We are ok. Unfortunately Mrs. MMG’s father is sick with bad cancer. She went to Colorado last month to see him. At least he is back home and not still in the hospital.

Has your crowded busy life calmed down?

Yes and No, but life goes on. Sorry to hear about Ms. MMG's father, I know the feeling. Lost my father to cancer in 03.

 

[MichiganMedGrower]

Yes and No, but life goes on. Sorry to hear about Ms. MMG's father, I know the feeling. Lost my father to cancer in 03.

My mom and brother both survived it.

 

[boilingoil]

My mom and brother both survived it.

Cool, my mother is a breast cancer survivor from the 80's and now a colon cancer survivor from 2 years ago.

 

[MichiganMedGrower]

Cool, my mother is a breast cancer survivor from the 80's and now a colon cancer survivor from 2 years ago.

Good news!

 

[vostok]

How much distance would you keep between a 600 watt HPS bulb and the top of the plant?

I recently bought a 315w CMh and the salesman told me to keep it about 18 inches away from the plant, which seems high, but I have confirmed that 16 to 20 inches is normal for LEC

I keep my 600 watt HPS about 10 inches away, which he thought that was too close....what's your opinion?cheersISK

see the above chart in inches, I have my 600w HPS @8 inches but it takes some venting in my 5x5 grow space

good luck

 

[ISK]

see the above chart in inches, I have my 600w HPS @8 inches but it takes some venting in my 5x5 grow space
good luck

thanks Vostok....I have that chart and that's why I felt 10 to 12 inches would be safe, as 8 inches is really pushing your luck

my grow space is in a standard bathtub, about 5 X 3.5 feet, with an open hood and reasonable air circulation, thus heat is not a big issue in the winter months

 

[vostok]

cool,,! don't forget that 'footprint' is rectangluer

there have been recent attempts by guys to diss that chart

they may have a point for 1Kw lights

but I've used it for years

with minimal hassle

good luck

 

[thumper60]

thanks Vostok....I have that chart and that's why I felt 10 to 12 inches would be safe, as 8 inches is really pushing your luck

my grow space is in a standard bathtub, about 5 X 3.5 feet, with an open hood and reasonable air circulation, thus heat is not a big issue in the winter months

I run the 6s at 12in 1ks at 16in in open hoods I could be closer but need the spread.

 

[Jaybodankly]

Bend that top cola over it is the tallest in the room. Aim for an even flat canopy. Then you can drop you lights. Watch the tips of the plant. They will burn first. Then lift the lights up a few inches and that is your sweet spot.