R
Rogo
Any real advantage switching from 600 to 1000 watt hps for last 4 weeks of flowering?
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More light is always better but if everything is going well I would just stick with your 6. I dont think changing to 1000 now will be of any benefit.
OldSSSCGuy
Active member
I disagree with chronicman. Any time you give the plants more light they will enjoy it. As long as your room does not load up with high temps from the increased light you will see a larger return.
Try it yourself. IMHO Its worth it.
Try it yourself. IMHO Its worth it.
Not correct. There is such a thing as giving plants to much light and there are many light charts and many articles on how much light you should be using dependent on the grow space and number of plants. They wont grow any faster by flipping to a 1000W.
How much light is needed?.
The minimum amount of light required by marijuana plants is around 3000 lumens per square foot. However, it's not 100% accurate, since although you may have a 10,000 lumen light, the amount of light that reaches the plant varies with the distance between the light and plants, and reflectivity of the grow box. The ideal amount is somewhere around 7000-10,000 lumens/sqft, and as long as the plants do not burn, as much light can be used as you want.
(*note, the sun produces about 10,000 lumens/sqft, on a sunny summer day).
Determining lumens for your grow area.
Determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet)
If you have a 1000 watt High Pressure Sodium, that produces (approx.) 107,000 lumens.
Divide this by 16 (your square footage) 107,000 / 16 = 6687 lumens per square foot.
So just divide the total amount of Lumens, by the total amount of Sq ft, and thats your lumens per square foot.
(G FAX)
The minimum amount of light required by marijuana plants is around 3000 lumens per square foot. However, it's not 100% accurate, since although you may have a 10,000 lumen light, the amount of light that reaches the plant varies with the distance between the light and plants, and reflectivity of the grow box. The ideal amount is somewhere around 7000-10,000 lumens/sqft, and as long as the plants do not burn, as much light can be used as you want.
(*note, the sun produces about 10,000 lumens/sqft, on a sunny summer day).
Determining lumens for your grow area.
Determine the square footage of your area (example in a 4 foot by 4 foot area, there is 16 square feet)
If you have a 1000 watt High Pressure Sodium, that produces (approx.) 107,000 lumens.
Divide this by 16 (your square footage) 107,000 / 16 = 6687 lumens per square foot.
So just divide the total amount of Lumens, by the total amount of Sq ft, and thats your lumens per square foot.
(G FAX)
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R
Rogo
Thanks for the feedback, all sound advice, I think Ill just apply more scientific lighting methods for my next grow... My girls are indicas and looking amazing.... About 4 weeks to go....
OldSSSCGuy
Active member
All I can say is what worked for me bro... I said nothing about them growing faster, but for me they -have- grown larger, denser buds with more light applied - even in a reduced time cycle. Only reason I've not done it as a matter of course is the electrical use it means. But I've gone from 1k to 2k at day 30 over the same (about) 6x6 space and seen enough to convince me of an improvement in the final product. Not talking about going from 1k to 15k or something.
Its just an opinion but regardless the science you cannot supply an indoor HID room with anything near what mother nature can do on a sunny day. There is not a case of 'too much light', for me its always been a 'too much heat' issue more than plants reducing or showing zero effect from the extra light.
So I stand by it. More light = happier plant = happy nugs
Its very easy to give indoor plants too much light over the course of a day.
The sun isnt at max intensity for 12hrs like indoor lighting.
They can even take high temps outside.
A lot of times what looks like heat stress can just be too much light over the course of a 12hr cycle.
The sun isnt at max intensity for 12hrs like indoor lighting.
They can even take high temps outside.
A lot of times what looks like heat stress can just be too much light over the course of a 12hr cycle.
Agreed...........
