LED vs HPS

jimihendrix1

jimihendrix1

Well-Known Member
You need about 650w to replace a 1000w HID. Ill use a 1000w Hortlux HPS buld as an example.
Gavita is 645w, and they say their 1700e is a direct replacement for a 1000w HID, in a 4 x 4 area. The 1700e is 645w, and puts out 1781umol.

The 1000w Hortilux HPS is 1880 umol.

At that rate going by Gavita Umol to watts, you need 40.3w/Sq/Ft
The 1000w Hortilux is 62.5w per Sq/Ft.

A 600w Hortilux HPS covers a 3 x 3 area, and is 55w per Sq/Ft.

Also to utilize all this light you better either have a good CO2 set up, or all the fresh Air Flow possible, or it wont use all of the light, and may cause plant damage.
I mainly use 1000w HIS/Hortilux, and also have a Gavita 1150w DE lamp, and a Gavita 1700e. Ive been using the Gavita 1700e, and a 1000w Hortilux HPS for seedling-Veg.

I also mainly use 3 1000w Hortilux for flowering because you have to use the Gavita DE at 36-40 inches, or it will totally fry your plants. Depending on the time of year, I can get a 1000w Hortilux 20 inches from the canopy, and not burn them. Temps are from between 78f-84f.

I also usually grow trees, and use clones. When I grow this way, depending on the strain, I use 2 plants per 1000w Hortilux in 20 gallons of Promix BX, which is 6 plants under 3 1000w HID, and then I place 5-6 more plants around the edge of the garden in 5 gallon containers. I veg in 5 gallon containrs, and when I flower I transplant into 20 gallon. So I just leave 5-6 plants in the veg containers. Depending on the strain, and veg time, I can get 12oz per plant from an old Barneys farm G13 x Haze clone Ive had for 10 years. But dont buy Barneys now. When they went all fems they sucked, and when they started selling regulars again, they still sucked, and their G13 x Haze is nothing like it used to be.
If I use seeds, I keep them in 5 gallon containers. Last harvest of the G13 x Haze with 11 plants I pulled 83oz with 45 days veg from clone.

I got 62oz from the 6 plants in 20 gallons, and 23 out of 5 plants in 5 gallons.
 
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rootforme

rootforme

Well-Known Member
PJ Diaz said:
1170 watts of actual draw from the wall in a 4x4? Seems quite excessive.
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I don't think it's excessive and neither do my plants unless I'm 8" off the canopy. The point is Im keeping the lights higher and getting more even distribution along with better light penetration. I'm matching my target DLI in every square inch. Where most sit at 1000 micromoles at center and 500 micromoles at the edges I'm at about 1500 micromoles evenly distributed throughout the entire canopy.
 
lusidghost

lusidghost

Well-Known Member
rootforme said:
I don't think it's excessive and neither do my plants unless I'm 8" off the canopy. The point is Im keeping the lights higher and getting more even distribution along with better light penetration. I'm matching my target DLI in every square inch. Where most sit at 1000 micromoles at center and 500 micromoles at the edges I'm at about 1500 micromoles evenly distributed throughout the entire canopy.
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Do you have the lights 8' off the canopy then? What brand is it?
 
rootforme

rootforme

Well-Known Member
The light is 48" x 48" and is sitting about 16 - 24" above the canopy depending. I'm trying out a budget brand light that's performing as well as other lights costing twice the price.

White Rose LED strips 130w each
I bought the White Rose 9000w(6 strips) + White Rose 4500w(3 strips), same lights, and combined the 9 into one light.
 

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lusidghost

lusidghost

Well-Known Member
rootforme said:
The light is 48" x 48" and is sitting about 16 - 24" above the canopy depending. I'm trying out a budget brand light that's performing as well as other lights costing twice the price.

White Rose LED strips 130w each
I bought the White Rose 9000w(6 strips) + White Rose 4500w(3 strips), same lights, and combined the 9 into one light.
Click to expand...
You are frying your plants. Look at how they are starting to taco and the serrated edges are all standing up as much as they possibly can. Also the light green color.
 
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rootforme

rootforme

Well-Known Member
They look good to me. When the light was 8" away they were lightening from the light but since I moved it up they look healthy and are producing fast. The plant is definitely utilizing the additional light.

"While many indoor growers give their plants around 300 to 750 micromoles of light per square meter per second (µmol/m²s) using either double-ended, high-pressure sodium (HPS) or specialized horticulture LED lights, the researchers found that a simpler and more cost effective lighting setup can result in even greater harvests.
Cannabis crops continue to grow in a linear fashion as lighting is intensified at least up to 1,500 µmol/m²s. And that’s achievable by using high intensity, broad-spectrum (white) lights that cost a fraction of what growers spend on those designed specifically for horticulture.
It’s also more than twice the intensity of a 1,060 watt HPS light, which is “almost universally considered the optimal lighting for growing cannabis.”
For their experiment, the team, which involved personnel from the Greenseal Cannabis Company, grew hundreds of plants and kept all other conditions like temperature and soil composition constant. But the crops were exposed to different types of light and light intensity. They discovered that for every additional µmol/m²s that reached the plant, the yield increased by .41 grams.
So when a plant was exposed to an HPS light that delivered an intensity of about 500 µmol/m²s, the total harvest was just under 300 grams. But plants that got 1,500 µmol/m²s from a general purpose LED light produced up to nearly 800 grams."

I'd rather push them to 1500µmol then stay at 500..
 
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rkymtnman

rkymtnman

Well-Known Member
rootforme said:
They look good to me. When the light was 8" away they were lightening from the light but since I moved it up they look healthy and are producing fast. The plant is definitely utilizing the additional light.

"While many indoor growers give their plants around 300 to 750 micromoles of light per square meter per second (µmol/m²s) using either double-ended, high-pressure sodium (HPS) or specialized horticulture LED lights, the researchers found that a simpler and more cost effective lighting setup can result in even greater harvests.
Cannabis crops continue to grow in a linear fashion as lighting is intensified at least up to 1,500 µmol/m²s. And that’s achievable by using high intensity, broad-spectrum (white) lights that cost a fraction of what growers spend on those designed specifically for horticulture.
It’s also more than twice the intensity of a 1,060 watt HPS light, which is “almost universally considered the optimal lighting for growing cannabis.”
For their experiment, the team, which involved personnel from the Greenseal Cannabis Company, grew hundreds of plants and kept all other conditions like temperature and soil composition constant. But the crops were exposed to different types of light and light intensity. They discovered that for every additional µmol/m²s that reached the plant, the yield increased by .41 grams.
So when a plant was exposed to an HPS light that delivered an intensity of about 500 µmol/m²s, the total harvest was just under 300 grams. But plants that got 1,500 µmol/m²s from a general purpose LED light produced up to nearly 800 grams."

I'd rather push them to 1500µmol then stay at 500..
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cool story. but learn how to read your plants. leaf margins arent' supposed to do that.
 
larfybudz

larfybudz

Well-Known Member
rootforme said:
They look good to me. When the light was 8" away they were lightening from the light but since I moved it up they look healthy and are producing fast. The plant is definitely utilizing the additional light.

"While many indoor growers give their plants around 300 to 750 micromoles of light per square meter per second (µmol/m²s) using either double-ended, high-pressure sodium (HPS) or specialized horticulture LED lights, the researchers found that a simpler and more cost effective lighting setup can result in even greater harvests.
Cannabis crops continue to grow in a linear fashion as lighting is intensified at least up to 1,500 µmol/m²s. And that’s achievable by using high intensity, broad-spectrum (white) lights that cost a fraction of what growers spend on those designed specifically for horticulture.
It’s also more than twice the intensity of a 1,060 watt HPS light, which is “almost universally considered the optimal lighting for growing cannabis.”
For their experiment, the team, which involved personnel from the Greenseal Cannabis Company, grew hundreds of plants and kept all other conditions like temperature and soil composition constant. But the crops were exposed to different types of light and light intensity. They discovered that for every additional µmol/m²s that reached the plant, the yield increased by .41 grams.
So when a plant was exposed to an HPS light that delivered an intensity of about 500 µmol/m²s, the total harvest was just under 300 grams. But plants that got 1,500 µmol/m²s from a general purpose LED light produced up to nearly 800 grams."

I'd rather push them to 1500µmol then stay at 500..
Click to expand...
Your plants are clearly stressed from the light, believe it or not.
 
bk78

bk78

Well-Known Member
rootforme said:
They look good to me. When the light was 8" away they were lightening from the light but since I moved it up they look healthy and are producing fast. The plant is definitely utilizing the additional light.

"While many indoor growers give their plants around 300 to 750 micromoles of light per square meter per second (µmol/m²s) using either double-ended, high-pressure sodium (HPS) or specialized horticulture LED lights, the researchers found that a simpler and more cost effective lighting setup can result in even greater harvests.
Cannabis crops continue to grow in a linear fashion as lighting is intensified at least up to 1,500 µmol/m²s. And that’s achievable by using high intensity, broad-spectrum (white) lights that cost a fraction of what growers spend on those designed specifically for horticulture.
It’s also more than twice the intensity of a 1,060 watt HPS light, which is “almost universally considered the optimal lighting for growing cannabis.”
For their experiment, the team, which involved personnel from the Greenseal Cannabis Company, grew hundreds of plants and kept all other conditions like temperature and soil composition constant. But the crops were exposed to different types of light and light intensity. They discovered that for every additional µmol/m²s that reached the plant, the yield increased by .41 grams.
So when a plant was exposed to an HPS light that delivered an intensity of about 500 µmol/m²s, the total harvest was just under 300 grams. But plants that got 1,500 µmol/m²s from a general purpose LED light produced up to nearly 800 grams."

I'd rather push them to 1500µmol then stay at 500..
Click to expand...

Did you really just copy and paste a article from weed maps?
 
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