How To Use Progressive Web App aka PWA On 420 Magazine Forum
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Yeah.....I was learning with a 1000 until the rest just landed in my lap. LOL crazy right?
Cant complain about that
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?