Quote:
Originally Posted by jaye13
i ve been told it works out watt 600 = 600 grams
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Can you focus at question not vegetation, nutrients and other ?
Let pass this 3 examples.
-Skilled grower
-Used 600W bulb
-Chem fertilizer
-Hydroponic,Mapito
-Same vegetation
-Same strain
Situation #1
Room 1m2/9ft2.Distance from top of plant and bulb is 1m/3ft.
Growth 16 plants.Perfect room conditions.
Situation #2
Room 1m2/9ft2.Distance from top of plant and bulb is 60cm/2ft.
Growth 16 plants.Perfect room conditions.
Situation #3
Room 1m2/9ft2.Distance from top of plant and bulb is 30cm/1ft.
Growth 16 plants.Perfect room conditions.
Result from Situation #1 > 150grams.
Result from Situation #2 > 400grams
Result from Situation #3 > 650grams
How this come ? (Watt - Lumen)
Very simple,Watt is not unit of light measurement.Watt is measurement unit for power conversion or simple for spended energy.Take a look at your Fridge and you will find to he spending 400W.He don't transmit light,he use energy for something else,right ?
Now,bulb use electric energy to produce light.Measurement unit for light is Lumen.Hence plants need light (Lumens) with specific color (nm) for photosynthesis (food making) you can not say Watt cause that is totally wrong.
Calculating yield who directly depends of issued Lumens but say Watt are not correct.
Lumen on distance (Sun - HPS)
Like you see 3 examples have all same characteristics except one.Distance.
To can give you better view at this, I will use example of Sun and HPS.
SUN,release really big amount of Lumens but cause distance we got only 5 000 Lumens per 1ft2 or about 50 000 Lumens per 1m2 what falling on the ground.
We just trying to replace sun with hps but sun give 50 000 Lumens on 2m/6ft above ground and 50 000 Lumens on the ground.Absolutely no difference.
Will not go deeper where is more lumens,on the equator or somewhere at north ... that is another story.
HPS,can not beat sun but HPS losing lumens at distance like SUN.
Big difference is cause sun transport really big amount of lumens on large distance and 2m/6ft doesn't mean nothing.For HPS 2m/6ft is very very big distance so hps will lose lumens much more than you think.
Will not go deeper in story where Philips say to his bulbs losing 10% of initial lumens in first 10 days.So 600W with 90 000 lumens after just 10 days will be 600W with 81 000 of initial lumens.
After all this its normal to plants do not receive same amount of lumens cause distance even if is light source absolutely same, 600W.
Hence that, yield from situation #1,#2 and #3 can not be same.
I push my friend to made this video, so please take a look.
Also, 600W bulb can give you between 600 and 750 grams.
This guy is not pro he is master ... just indo0rmaster
No its not truth of course.
hope I did answer you