UMOL, PPFD and lux terminology

[Vondetour]

Doing more reading about lighting and for example PPFD Seedling / Clone 100 – 300, Vegetative 250 – 600 and Bloom / Flowering 500 – 1050. Now I have two viparspectra p1000 led grow lights 100 watts each


I don't fully understand this umop, ppfd and lux terminology so is my P1000 led grow lights suited for growing two cannabis plants ?, I saw a post on reddit how someone ask this and they were told this light just barely does the job.


I ask you pros, is my two P1000 led grow lights suited for growing two cannabis plants ?. Should I buy something else and if so what would you recommend for two plants in a 2x4 tent ?.

 

[chilliwilli]

I have no experience with viparspectra but the 2 p1000 should be enough for a 2×4

 

[Vondetour]

I have no experience with viparspectra but the 2 p1000 should be enough for a 2×4

Thanks, back to reading more about growing.

 

[Koondense]

Put three plants in a 2x4 so the light distribution will get better.
Or two very vigorous ones and make an even scrog canopy.

Cheers

 

[foomar]

With a 2 by 4 i found two comparable 100w leds was not sufficient.

Running three 100w at 80% is just right with a much more even spread.

 

[Vondetour]

With a 2 by 4 i found two comparable 100w leds was not sufficient.

Running three 100w at 80% is just right with a much more even spread.

So three 100w lights for two or three plants ?.

 

[Vondetour]

Put three plants in a 2x4 so the light distribution will get better.
Or two very vigorous ones and make an even scrog canopy.

Cheers

How does three plants distribute light ?.

 

[foomar]

Have ran four to thirty plants flowered out in a 2 by 4.
Choose your pot size and veg time and the numbers vary widely , but two or ten will give the same total yield more or less.
I would not run them at full power , 80% will extend their lifespan significantly.

 

[Vondetour]

Have ran four to thirty plants flowered out in a 2 by 4.
Choose your pot size and veg time and the numbers vary widely , but two or ten will give the same total yield more or less.
I would not run them at full power , 80% will extend their lifespan significantly.

Everything I've read so far has been 1 plant for 1 100 watt light, you've done 4. Was that with 100 watt lights ?.

 

[foomar]

Have done 2,4,6 and many more of the same clone and the total yield is similar in the sama time span.
Just over a gramme per watt is straightforward without micro manageing everything and can be pushed much higher with.

200 watts spread over 8 square feet is only 25 watts , and proved insufficient in every way in flower despite what the makers tell you about coverage.

You need every budsite within three feet of the light or the bottom will need another month to finish , i find this easier to do with 8 - 10 plants in 10 litre pots veged to 8 - 10 leaders each.

Another 100 watts made a huge improvement and haveing three light sources evens out the yew moles.

 

[Vondetour]

Have done 2,4,6 and many more of the same clone and the total yield is similar in the sama time span.
Just over a gramme per watt is straightforward without micro manageing everything and can be pushed much higher with.

200 watts spread over 8 square feet is only 25 watts , and proved insufficient in every way in flower despite what the makers tell you about coverage.

You need every budsite within three feet of the light or the bottom will need another month to finish , i find this easier to do with 8 - 10 plants in 10 litre pots veged to 8 - 10 leaders each.

Another 100 watts made a huge improvement and haveing three light sources evens out the yew mole

Have done 2,4,6 and many more of the same clone and the total yield is similar in the sama time span.
Just over a gramme per watt is straightforward without micro manageing everything and can be pushed much higher with.

200 watts spread over 8 square feet is only 25 watts , and proved insufficient in every way in flower despite what the makers tell you about coverage.

You need every budsite within three feet of the light or the bottom will need another month to finish , i find this easier to do with 8 - 10 plants in 10 litre pots veged to 8 - 10 leaders each.

Another 100 watts made a huge improvement and haveing three light sources evens out the yew moles.

So my two 100 watt lights is not enough to grow two plants ?.

 

[foomar]

Try it with two but compared to a 300 cmh or three leds i found it enougth to grow decent plants but not enougth to reach there potential.

Start with what you have and a few weeks into flower you will know and add another if needed.

 

[Creeperpark]

If the plants are lanky and spindly, they need more light. If they stay too short and stocky or leaf burn then less light. Very simple.

 

[foomar]

Viparspectras UK website says the following

Your plants need between 50-75 watts per square foot of plant canopy. We offer a wide selection of grow lights to provide all the light your plants need.

Which is double the watts that the unit provides.

 

[Koondense]

"50-75 watts per square foot" sounds way too much. Maybe for Hids?
I did fine with 25-35W/sqft Leds.

Cheers

 

[foomar]

Did a search around the low budget manufacturers and there is a huge variety of wattage per foot recommendations , from 30 to 70 in flower , and much is contradictory or advertiseing bollocks.
Few measure and instead use chip makers spec sheets under the best theoretical conditions and discount the power supply losses.
In reality they are all 15 -20 % below what they advertise.

 

[cellardwellar420]

Viparspectras UK website says the following

Your plants need between 50-75 watts per square foot of plant canopy. We offer a wide selection of grow lights to provide all the light your plants need.

Which is double the watts that the unit provides.

Looks soo good that light

 

[cellardwellar420]

I have no experience with viparspectra but the 2 p1000 should be enough for a 2×4

I think the new VS 1500pro has a lens to spread the light better