Do more lights equal more yield?

brianakabear · May 22, 2020

Ok so i just got a https://www.amazon.com/gp/product/B083JVXHF6
does it make sense to combine it in a 4 x 2 tent with my current https://420expertadviser.com/grow-lights/dimgogo-1500w-led-review-2/
or just replace the old one since the new one is full spectrum?
Will the red/blue light hurt/make no difference since i'm in pre-flower?
OR
THE MORE LIGHTS THE BETTER??

Fr3nzy · May 22, 2020

Yes and no, adequate even light is better after so many lux you will be light stressing them.

Hidd3nGr0w · May 22, 2020

Did you really read the product description? I do not think putting 2 100w led's in a 4x2 is going to be enough. 4x2=8sqft. 8sqft x 40 watt per sqft is 320 watt minimum. 3 of those would not even reach minimum.

revfunk · May 22, 2020

Hidd3nGr0w said:
Did you really read the product description? I do not think putting 2 100w led's in a 4x2 is going to be enough. 4x2=8sqft. 8sqft x 40 watt per sqft is 320 watt minimum. 3 of those would not even reach minimum.

This ^^^

One caveat is that judging your LED lighting by wattage alone is not accurate. You need to know the PPFD info about your light. Wattage is a good reference but is not what you should base your choices on.

That being said, if you go on wattage alone 240W is the bare minimum for a 4x2 space. LED efficiency varies from brand to brand based on several factors.

Cheers

brianakabear · May 22, 2020

bubblefunk said:
This ^^^

One caveat is that judging your LED lighting by wattage alone is not accurate. You need to know the PPFD info about your light. Wattage is a good reference but is not what you should base your choices on.

That being said, if you go on wattage alone 240W is the bare minimum for a 4x2 space. LED efficiency varies from brand to brand based on several factors.

Cheers

What light do you use? What size is your tent?

Aqua Man · May 22, 2020

If LED 30w/sq ft. Is a good place to be. That's actual watts from the wall. I feel a full spectrum is beneficial as spectrum does play a part in plant development. In essence yes MOAR light equals more yield but at a point there is to much. What that point is depends on your setup.

But as I say 30w/sq. Ft. Is a good place to be

revfunk · May 22, 2020

brianakabear said:
What light do you use? What size is your tent?

In my flowering tent (4x2x6'11) I will use both of these, 327W total. Average PPFD over 500 at 18 inches.

Okie338 · Jun 7, 2020

bubblefunk said:
This ^^^

One caveat is that judging your LED lighting by wattage alone is not accurate. You need to know the PPFD info about your light. Wattage is a good reference but is not what you should base your choices on.

That being said, if you go on wattage alone 240W is the bare minimum for a 4x2 space. LED efficiency varies from brand to brand based on several factors.

Cheers

No 100 W LED is worth shit, not ever. No good led manufacturer makes a powerful 100w led, it's a waste of money and time

revfunk · Jun 7, 2020

Okie338 said:
No 100 W LED is worth shit, not ever. No good led manufacturer makes a powerful 100w led, it's a waste of money and time

My 100W HLG that perfectly fills in a side of my flowering tent begs to differ

Aqua Man · Jun 7, 2020

Im gonna do a post this week on DLI and light saturation to help ppl understand how this light stuff all actually affects the plants if I can find the time. There is a lot to consider and I have seen so many posts of ppl in veg burning the shit out of thier plants lately. Intensity changes the needed photoperiod and vice versa. In veg specifically you can grow under significantly less light than is needed for flower. This is because the photo period.

revfunk · Jun 7, 2020

Aqua Man said:
Im gonna do a post this week on DLI and light saturation to help ppl understand how this light stuff all actually affects the plants if I can find the time. There is a lot to consider and I have seen so many posts of ppl in veg burning the shit out of thier plants lately. Intensity changes the needed photoperiod and vice versa. In veg specifically you can grow under significantly less light than is needed for flower. This is because the photo period.

Totally bro, totally

Aqua Man · Jun 7, 2020

bubblefunk said:
My 100W HLG that perfectly fills in a side of my flowering tent begs to differ

I agree if your getting 30w+ per sqft you golden. Even 20-30w sqft. will produce decently.

revfunk · Jun 7, 2020

Aqua Man said:
I agree if your getting 30w+ per sqft you golden. Even 20-30w sqft. will produce decently.

Exactly. Watts are watts, plain and simple. Within that, spectrum comes next. I could've easily used my 240W board in the 4x2x6'11 tent with "average" results but by adding the 100W HLG my watts/square foot hit the mark I prefer. Instead of 30w/sqft adding that simple HLG board brought it to 42.5w/sqft.

The nugs pictured were all grown with those same numbers

Cheers!

brianakabear · Jun 7, 2020

The light is fine. Got my PAR and LUX meter working on PPFD next. I just have got WAAAAAAAAAY too much in one tent.....

Fr3nzy · Jun 7, 2020

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

A NOTE ABOUT LED LIGHTS
A lux meter works with all types of “white” lights, which includes HID, CFL, and white LEDs (COB LEDs). However, it doesn’t work with “purple” LED lights, which emit a purple light due to their combination of blue and red LEDs. Unfortunately, most cheaper LED lights are these purple types. So, if you use one of these for growing, you would have to rely on manufacturer information about how much light the product really emits. Alternatively, you could obtain a light meter that can be used with these types of LEDs.

I copied and pasted this. I still use a lux meter on my blurple led and it was burning a plant around 75k so I'm not sure if Samsung's light meter in there phone is able to read it, but idk...

Aqua Man · Jun 7, 2020

Fr3nzy said:
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

A NOTE ABOUT LED LIGHTS
A lux meter works with all types of “white” lights, which includes HID, CFL, and white LEDs (COB LEDs). However, it doesn’t work with “purple” LED lights, which emit a purple light due to their combination of blue and red LEDs. Unfortunately, most cheaper LED lights are these purple types. So, if you use one of these for growing, you would have to rely on manufacturer information about how much light the product really emits. Alternatively, you could obtain a light meter that can be used with these types of LEDs.

I copied and pasted this. I still use a lux meter on my blurple led and it was burning a plant around 75k so I'm not sure if Samsung's light meter in there phone is able to read it, but idk...

Tested this info out myself as I use lux. I know par meter is better but really it's get me very close and the plants tell me the rest. Once dialed in I just measure and record. Again though the photoperiod will change these and I find an 18/6 light cycle pits these numbers close. If your Running 24/0 you may need to run a bit lower

Tech4523 · Jun 7, 2020

2 x Phlizon 2000w cob (450w)
1x Spider Farmer 2000w(200w)

4x4 area 400-600 par at 30 inch over the entire area.

detroitjoe · Jun 7, 2020

Yes. More light = bigger yields
BUT

you will need to work the plant According to intensity.

you will need to feed heavy and in faster increments.

Dr.B · Jun 8, 2020

Aqua Man said:
Im gonna do a post this week on DLI and light saturation to help ppl understand how this light stuff all actually affects the plants if I can find the time. There is a lot to consider and I have seen so many posts of ppl in veg burning the shit out of thier plants lately. Intensity changes the needed photoperiod and vice versa. In veg specifically you can grow under significantly less light than is needed for flower. This is because the photo period.

I just started learning about this yesterday!!! There are growers that run a 12 hour light cycle at 60 - 70% intensity, followed by 6 hours of overhead fluorescent light before dark with some surprising results. I have a hell of a time transitioning my plants from one medium power led to the high power one, pretty much as a rule. I'm running my current veg in seedling mode as of today, the plant is much, much happier in just 6 hours of awake time at 40% light intensity. I'm going to run with it. I'll cycle her up to 75% as I approach flower... Then, no mercy.

Aqua Man · Jun 8, 2020

Dr.B said:
I just started learning about this yesterday!!! There are growers that run a 12 hour light cycle at 60 - 70% intensity, followed by 6 hours of overhead fluorescent light before dark with some surprising results. I have a hell of a time transitioning my plants from one medium power led to the high power one, pretty much as a rule. I'm running my current veg in seedling mode as of today, the plant is much, much happier in just 6 hours of awake time at 40% light intensity. I'm going to run with it. I'll cycle her up to 75% as I approach flower... Then, no mercy.

How many watts per sqft?

Do more lights equal more yield?

Do more lights equal more yield?