New to LED question about vegging and dimming

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velvet_underground

Member

• Oct 16, 2016

• #1

I should have my Mau5-VII 8 cob kit tomorrow and will be setting it up..

I have a question about vegging with cobs.. I will be using this in a 3x3 tent for both veg and flower. Would it make sense to dim the light to around 50% and further away from the plants during veg? Them ramp up the intensity and lower (around 18") when ready to flower?

I'm very excited for my first grow with LEDs.

Thanks!

 

Mohican

Well-Known Member

• Oct 16, 2016

• #2

During veg I like to keep them high up/dimmer. The light can fry a new seedling.

You will also end up with more leaf in veg if it is too intense.

 

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velvet_underground

Member

• Oct 16, 2016

• #3

Damn, quick response! Thank you...

Do you think 50% is a good starting point for dimming or even less? I'd probably keep the lights as high as they could go in the beginning.

 

Tryguy

Member

• Oct 16, 2016

• #4

For light you can calculate loss in distance by doing square math. When you raise the height of a lamp that measure counts square. It is called

inverse square law. So dimming is the same as raising the light up.

 

HydoDan

Well-Known Member

• Oct 16, 2016

• #5

50% at 24" to start with.. then as your plant grows ...slowly increase the intensity so you hit full power the first week of flower.. then slowly move it closer.. needs to be a gradual transition.. watch for bleaching...

 

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VegasWinner

Well-Known Member

• Oct 16, 2016

• #6

velvet_underground said:

I should have my Mau5-VII 8 cob kit tomorrow and will be setting it up..

I have a question about vegging with cobs.. I will be using this in a 3x3 tent for both veg and flower. Would it make sense to dim the light to around 50% and further away from the plants during veg? Them ramp up the intensity and lower (around 18") when ready to flower?

I'm very excited for my first grow with LEDs.

Thanks!

Click to expand...

700ma is the average for vegging. Are you using 3500k or 5000k or mixed? May want some additional blues for vegging and reds for blooming. What type of timers are you going to use? Peace

 

Tryguy

Member

• Oct 16, 2016

• #7

Sorry for my fault, the device is dimmable...nice feature!

 

Mohican

Well-Known Member

• Oct 16, 2016

• #8

I have seen some amazing plants vegged under very low light. Light intensity is more important in Flower.

 

Evil-Mobo

Well-Known Member

• Oct 16, 2016

• #9

Mohican said:

I have seen some amazing plants vegged under very low light. Light intensity is more important in Flower.

Click to expand...

I agree here to a point, I think the way we veg has a lot to do with the desired final result. But for the average home grower yes

 

Mohican

Well-Known Member

• Oct 16, 2016

• #10

Definitely. I just mean that you can avoid growing a leaf bush by decreasing light intensity for some of the tighter indicas.

 

Evil-Mobo

Well-Known Member

• Oct 16, 2016

• #11

Mohican said:

Definitely. I just mean that you can avoid growing a leaf bush by decreasing light intensity for some of the tighter indicas.

Click to expand...

Yes sir and like I said not arguing a thing especially with you lol was just adding my $0.02

 

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velvet_underground

Member

• Oct 16, 2016

• #12

Thanks for the replies guys.. FYI, all of my cobs are 3500k.

 

optzulu

Well-Known Member

• Oct 16, 2016

• #13

Are you growing out of seeds ore clones ?
If from seed there is no point in dimming just blast them away with your light. They will love it and grow like rockets.

If cuttings you cant ofc.

 

Tryguy

Member

• Oct 27, 2016

• #14

I found this somewhere:

Vegetative: 35,000 - 70,000 lux
Flowering: 55,000 - 85,000 lux

How do you responders think of these numbers?
Fyi it is possible to 'make' a cheap luxmeter by using a smartphone and a free app. Not the real thing but indicative anyway.