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how much light (max) can we give to 1 auto plant

nextpablo420

nextpablo420

New member
How much maximum light can be used on a plant? I mean with low stress training and giving 65k to 70k lumens to each cola If we want a big plant and big yields Then how to use light and how much and can i use 750watts (true) ? And how much yeild can i expect with 750 true watts
 
THIS IS FROM ROYAL QUEEN seeds website


WHAT IS THE OPTIMAL AMOUNT OF LIGHT FOR CANNABIS PLANTS?


How much light your plants need will vary based on each phase of the grow cycle. Seedlings can’t take a lot of light, but once a plant is in veg, it needs just about all the light it can get. This allows plants to grow vigorously to their full potential. The same goes for flowering. Although plants in bloom thrive under a different spectrum of light than during veg, they still need a lot of light exposure to make sure the buds are as big as they can be.

Inner-Cannabis-Light.jpg

HOW MUCH LIGHT DO YOUR CANNABIS PLANTS REQUIRE?
  • Clones and seedlings: 5,000–7,000 lux
  • Vegetative growth: 15,000–50,000 lux
  • Flowering: 45,000–65,000 lux
  • Maximum recommended amount of light: 75,000 lux
What about even more light? At some point, increasing the light beyond a threshold plant can manage will actually diminish returns. Said differently, once you reach about 85,000 lux, it’s simply too much. Some strains may already show signs of light stress at only 75,000 lux, with the risk of light bleaching increasing at over 80,000 lux. To keep it safe, it is best to stay at or below 75,000 lux.
 
Now tell me should i use 10000 or 70000 lumens?

Also when i increase the distance of my cfls from 3 inch to 5 inch
Then the lumens fall from 20000 to 12000 or so
And when i add it more close like 2 inch from plant it crosses 25000 lumens
 
to get the sq. foot coverage_ what's important is how even the coverage is over the entire grow area. you can use your lux meter to measure the light intensity every sq foot_ like a grid_ for a 4x4 the would be 16 readings, basically. start directly under the light and then move outwards to the outside edges of where you expect your plant to grow. measuring lumens count really provide the information you need to determine the pfd but it will give you a decent idea of how much falloff there is from the center to the outside. If you have a 750 watt light that will be plenty for one plant. train her so the colas are as close to even as you can get them. Start with the light higher than you think and then lower a bit at a time. higher for younger plants and lower as they mature. If leaves start to show signs of heat or light stress back them off. Sometimes I hit them hard one day and then back them off a bit the next. you may also be able to get a dimmer for your light. that way you can "experiment" with how close you can get without causing stress and without needing more "headroom" to move the lights up. Cheers and happy growing! With COVID-19 spending time in
your garden is a good way to pass some of the time! Best health to all.
 
Here's how I do it (hasn't failed in 10 yrs). Trying not to hold the tent wide open, hold sensor level with the top of the tallest plant (or cola) in canopy. When meter reads between 45,000 and 50,000 (for veg) it's fine. Higher than 50,000, time to raise the light an inch or two. Max for flower, 65,000 or so, don't burn your buds. Nice meter, mines a cheapie but does the job ;). Good luck, & hope that answered your question.
 
Yeah that is what i was thinking to do with my plants

Not to hold the tent wide open means?
And can i bring my household 40 watt led bulb as near as 4,5 inch?
Its giving a lot of lux in 3,4 inch from plant range i mean like 40,50k lux at a point
My plants are about 2.5 weeks old and aboit 3,4 inch wide so only one led will work?
Or should i increase the distance of light to 12 or 15 inch and use 1,2 more light,
I am using normal led bulbs 40,50 watts which gives 4,5k lumens respectively.
 
“Not to hold the tent wide open” means to not open the tent wide.. if you have a window you could hang it about at the top of the tent and close it look through the window to get best reading

You could keep the household Leds closer to the plants because they produce less heat and light then a traditional grow light .. if you move the lights further away the plant will grow y’all and skinny looking for light

Also if your only getting 12k lumens at 5 inches and 20k at 2inches then 2 inches is better but yourll need more lights to cover larger area
 
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