Question on lights n area

[PEOPLEZ]

I have one 1000 two 600 and one 400 Watt hps. How much space would I need for all four lights?

 

[CISCOKID]

Well, what is it you want to do with them?

All for flower?

What do you have for air exhaust and circulation? Need more input

 

[Jimmycricket]

with a normal reflector a 1000 can cover up to a 7x7 area a 600watt would cover 5x5 feet and a 400watt is good for about 4x4

 

[Fuzzy Duck]

On average... optimal wattage per square foot is 65w with the average is 50w & that bulb size does effect end yield... for hps bulbs


250w will cover a 2' by 2' area, thats about 62.5 watts per square foot thats pretty optimal.

400w will cover a 3' by 3' area, thats about 44 watts per square foot thats reasonable average.

600w will cover 4' by 4' area, thats about 37 watts per square foot thats above minium requirements but not quite average.

1000w will cover a 5' by 5' area, thats about 40 watts per square foot thats just below average...


Hanging height per bulb wattage also differs, the higher the wattage the greater the hanging height to avoid heat stress/burn symptoms & may relate to square law of light effect.


We must factor in square law of light effect which means hanging height of hoods does effect light energy reaching the plants, kind of diminshing effect over distance ya see ! aprox loss of 1/4 of bulb wattage per foot of hanging height

This may be related to type of hoods used !

Standard hoods mean greater hanging height to avoid heat stress & light burn to which the square law of light does effect.

Air cooled hoods/reflectors means a closer hanging height meaning more light energy being used by plants resulting in improved yields... this adds cost & also effects light foot print as in being a small area of coverage.


Light foot print is governed by reflector design & most being a rectangle design with others being square... which may lead to hanging arrangement for best coverage !

 

[Jimmycricket]

I like ducks answer more then mine, I was figuring a bit high.

 

[PEOPLEZ]

Yeah.....I was learning with a 1000 until the rest just landed in my lap. LOL crazy right?

 

[miwa]

Its not how much room you need for lights..but how much light you need for your room.....

 

[Jimmycricket]

Yeah.....I was learning with a 1000 until the rest just landed in my lap. LOL crazy right?

Cant complain about that

 

[miwa]

Cant complain about that

what Jimmy said..

 

[nobody1]

On average... optimal wattage per square foot is 65w with the average is 50w & that bulb size does effect end yield... for hps bulbs


250w will cover a 2' by 2' area, thats about 62.5 watts per square foot thats pretty optimal.

400w will cover a 3' by 3' area, thats about 44 watts per square foot thats reasonable average.

600w will cover 4' by 4' area, thats about 37 watts per square foot thats above minium requirements but not quite average.

1000w will cover a 5' by 5' area, thats about 40 watts per square foot thats just below average...


Hanging height per bulb wattage also differs, the higher the wattage the greater the hanging height to avoid heat stress/burn symptoms & may relate to square law of light effect.


We must factor in square law of light effect which means hanging height of hoods does effect light energy reaching the plants, kind of diminshing effect over distance ya see ! aprox loss of 1/4 of bulb wattage per foot of hanging height

This may be related to type of hoods used !

Standard hoods mean greater hanging height to avoid heat stress & light burn to which the square law of light does effect.

Air cooled hoods/reflectors means a closer hanging height meaning more light energy being used by plants resulting in improved yields... this adds cost & also effects light foot print as in being a small area of coverage.


Light foot print is governed by reflector design & most being a rectangle design with others being square... which may lead to hanging arrangement for best coverage !

Thank you for that informative post! I have a friend who is starting his first grow. He has a 4x2x6.5 tent. He's thinking of getting a 600w Hps/Mh set up. He wants to do a waterfarm 2-3 bucket or 2-3 plant first grow. Hes been researching CFLs as well. It makes perfect sense as to what you said about height lowering the light footprint, so he was thinking of hanging 2 CFLs warm to give an added range. What are your thoughts on this? Also I should mention he would be using a cool sleeve with a 4in inline exhaust fan. Thanks in advance! Also, considering its a waterfarm set up and the space allowed, what would be an ideal amount of plants for that space?

 

[Fuzzy Duck]

Thank you for that informative post! I have a friend who is starting his first grow. He has a 4x2x6.5 tent. He's thinking of getting a 600w Hps/Mh set up. He wants to do a waterfarm 2-3 bucket or 2-3 plant first grow. Hes been researching CFLs as well. It makes perfect sense as to what you said about height lowering the light footprint, so he was thinking of hanging 2 CFLs warm to give an added range. What are your thoughts on this? Also I should mention he would be using a cool sleeve with a 4in inline exhaust fan. Thanks in advance! Also, considering its a waterfarm set up and the space allowed, what would be an ideal amount of plants for that space?

CFL & T5/8 tubes suffer greatly from the square law of light effect... thats why we often hang them 1 inche / 2.5 cm above the plants, hanging height beyond 4 inches / 10cm they become viirtually useless for plant growth !


I myself wouldn't waste my time or money with CFL supplemental lighting to aid in flowering, if any thing i would be more inclined to use T5 tubes as they cover a larger area than a CFL bulb


How ever CFL & T5/8s work perfectly fine for vegging plants with if used with in an inche of the plant growing tip.