help with light distance

[djr3065]

I am growing 4 diesel plants using a MH for veg. and plan on switching to a HPS for flowering. The lighting system I am using is 400 watt. I was wondering what the proper distance the light should be from the top of the plants? Any input is greatly appreciated.

 

[Bonzi Lighthouse]

Depends, you left out so many variables that it is impossible to answer with the information given.

 

[littleyellowbusrider]

Depends on the wattage of the bulbs you get.. Home Depot has 100 watt for about $14.99 or so and that one stays about a foot away from my plants. Also depends on your fans. I keep my fans on high speed for cooling and also for a fat stalk. I water them only in the early morning hours before sunrise and again 15-20 minutes before sunset.. They seem to really love feeding and watering times like that and the smell just tells it all when they are so young and smelling so strong...

 

[desertrat]

very easy - use your hand at the top of the plant as a temperature gauge, lower the light as far as you can with your hand being comfortably warm, not hot.

 

[The*Mad*Hatter]

im gonna agree with desertrat on this one...yup, use your hand for a temp measurment...

 

[Bigby]

Depends, you left out so many variables that it is impossible to answer with the information given.

Not really impossible to answer is it, just impossible to be accurate.

 

[Bigby]

Depends on the wattage of the bulbs you get.. Home Depot has 100 watt for about $14.99 or so and that one stays about a foot away from my plants. Also depends on your fans. I keep my fans on high speed for cooling and also for a fat stalk. I water them only in the early morning hours before sunrise and again 15-20 minutes before sunset.. They seem to really love feeding and watering times like that and the smell just tells it all when they are so young and smelling so strong...

He says in his post that his light is 400w.