Happy Friday
I am upgrading to a 6x8room is this enough lighting or do I get another one 6 autoflowers
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It enough light to veg one plant. You’ll need more than that during flowering to maximize yield.
If you want to fully light a 6x8 space you’ll need ~1,920 watts (at 40 watts per square foot.)
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That would not be close to enough late for a room that size you would need at least 10 of those maybe more for six plants in a 4x4 area you would probably need four or five at least
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Dont copy my style man 
Just jokin. 6 x 8 phew thats a garden!!
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Welcome to the community , That’s a big grow space. No not enough lighting. I would suggest start with a 4x4 space will be much more affordable to light up efficiently. You can turn out a lot of buds in a small space. Good luck my friend ! 
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As stated, much more light. Better start saving for real lights, like from HLG.
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I have four(4) Vivosun VS1000s like yours for a 3x3 tent.
At the minimum you would need around 0.75 of these lighting units per plant.
I grew 4 autos my first grow with just 2 lights and only ended up with 6.75 oz…but if that is enough weed for you, then that is fine. You really need about 35 input watts per sq ft of a full tent to maximize your yield.
Good luck whatever you decide. I love my 100W Vivosun LEDs. I started with 2 then bought the other 2 over about an 18 month period to spread it out and make it more palatable to wifey.
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I have a 4x6 and i run a Growers Choice Roi-e720 (720watts). And it’s just slightly under powered
It would take 2 of my lights to fully cover a 4x8 space even more for 6x8.
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4x4x7 is what I went with and that has turned out to be a solid choice. I have an array of plants and veggies. Next run will be different, but I know I have the right amount of space to work with.
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Damn. Nice forest yo!
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Yeah , 4x4x7 is a good choice. I Always recommend the tallest tent your space will accommodate. Happy growing !
I have the same lights u do what power settings do u have them at? I have mine at 75% was scared of light burn so didn’t do 100%. Just switched to 12/12 light cycle. Was wondering if i should do 100% light power? Also i only have one light in a 3x3 tent. Oh I’m new this is my first grow.
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I use 2 FC-E 6500 and one or two FC-E3000 for that space and plant count, but I run photos. I think that comes out to about 2kw. I have gotten by on just one 6500 which is 1300w but more is DEFINITELY better.
How many inches above the plants are your lights? That would help knowing that.
About 19 to 23 in above i have 3 lady’s and not all the same height
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I go as close as 10" @ 100%