Are parabolic reflectors worth their weight?
- Thread starter pftek
- Start date
the situation is I'm limited to 1000 watts of electricity. so wondering if it makes a huge difference to get these to help when I can't increase my wattage.
Mr.Therapy Man
Well-Known Member
Those hoods run too hot for me...........peace
Roseman
Elite Rolling Society
In my opinion, the Reflector is not going to make that much difference compared to the wattage used.
Let me tell you about CFLs.
From Ed Rosenthal:
In the new Skunk Magazine there was a question in the "Ask Ed" section that just made my night last night when reading it...
The question was:
I intend to grow a single cannabis plant in a space 1' x 2'. What light would you recommend? I was think of using four 30-watt compact fluorescent lamps. Will this be enough? Cost isn't an issue but I am deterred from getting a high pressure sodium [light] because of the amount of heat the bulb produces.
Answer:
As you mentioned, you have several lighting systems to choose from, including compact fluorescents and high pressure sodium (HPS) lamps. Among HPS lamps you have a choice between a single 100-watt lamp which uses a total of about 120-watts and emits about 8,800 lumens(73 lumens per watt) or a 150-watt lamp, which uses about 180 watts and emits almost double that-15,800 lumens (87 lumens per watt).
A 42-watt compact fluorescent (CFL) emits about 2700 lumens(64 lumens per watt). Four 42 watt CFLs use 168 watts and emit 10,800 lumens. Other size CFLs have a similar efficiency.
However, that is only part of the story. Plants use mostly red and blue light. Yellow and green light is of little use to them, so light that is emitted in these spectrums is wasted energy. Most of the light emitted by HPS lamps is in the yellow spectrum. Only a small amount of the emitted light is is in the orange or red spectrums, which plants use efficiently. Warm white fluorescents (2700 Kelvin) emit a greater portion in the red and orange sectors.
Although fluorescents produce only about 75% of the light per watt that the HPS does, the amount of light usable by the plant is equal or probably higher with the fluorescents. You may wish to experiment to see if adding a single cool white CFL to replace one warm white results in shorter, stouter stems and more vigorous growth. The reasoning is that warm whites don't emit much blue light, which the plants use for photosynthesis and to regulate their growth. The cool white bulb supplies the blue light.
My call for your unit would be to use several (three to five) CFLs with a total input of between 120-160 watts. Although the 150 watt HPS is a bit more efficient that the CFLs in total output, watt for watt the fluorescents provide as much useful light as the HPS lamp. Heat is another consideration. The HPS runs much hotter and emits more heat than the fluoescents.
Make sure to use reflective material around the garden so that any light escaping the garden is reflected back to the plants. Any light that doesn't get to the plant leaves is wasted.
Look at a lumen/watt ration of various CFL's. The higher the wattage of CFLs, the lower the lumen/watt ratio. This chart was submitted by Jerry Garcia, of RIU and edited for typos.
For example...
the 200w listed at 9250 lumens for a lumens/watt ratio of 9250/200=46.25
the 150w is listed at 7500 lumens for a l/w ratio of 7500/150=50
the 125w is listed at 6500 lumens for a l/w ratio of 6500/125=52
the 42w are listed for 2700 lumens, l/w ratio of 2700/42=64.28
I have some 26w that give off 1700 lumens for a l/w ratio of 1700/26=65.38
GE lists some 13w that give off 825 lumens for a l/w ratio of 825/13=63.46
So, according to these numbers the most efficient bulbs for growing are the 26w that emit 1700 lumens. If you used 8 26w bulbs (208 watts total) you'd be getting 13,600 lumens...4,350 more lumens than a single 200 watt cfl.
I suppose you need to purchase more sockets and cords and things to support 8 bulbs, but in the long run more lower watt CFLs seem like the way to go.
__________________
Let me tell you about CFLs.
From Ed Rosenthal:
In the new Skunk Magazine there was a question in the "Ask Ed" section that just made my night last night when reading it...
The question was:
I intend to grow a single cannabis plant in a space 1' x 2'. What light would you recommend? I was think of using four 30-watt compact fluorescent lamps. Will this be enough? Cost isn't an issue but I am deterred from getting a high pressure sodium [light] because of the amount of heat the bulb produces.
Answer:
As you mentioned, you have several lighting systems to choose from, including compact fluorescents and high pressure sodium (HPS) lamps. Among HPS lamps you have a choice between a single 100-watt lamp which uses a total of about 120-watts and emits about 8,800 lumens(73 lumens per watt) or a 150-watt lamp, which uses about 180 watts and emits almost double that-15,800 lumens (87 lumens per watt).
A 42-watt compact fluorescent (CFL) emits about 2700 lumens(64 lumens per watt). Four 42 watt CFLs use 168 watts and emit 10,800 lumens. Other size CFLs have a similar efficiency.
However, that is only part of the story. Plants use mostly red and blue light. Yellow and green light is of little use to them, so light that is emitted in these spectrums is wasted energy. Most of the light emitted by HPS lamps is in the yellow spectrum. Only a small amount of the emitted light is is in the orange or red spectrums, which plants use efficiently. Warm white fluorescents (2700 Kelvin) emit a greater portion in the red and orange sectors.
Although fluorescents produce only about 75% of the light per watt that the HPS does, the amount of light usable by the plant is equal or probably higher with the fluorescents. You may wish to experiment to see if adding a single cool white CFL to replace one warm white results in shorter, stouter stems and more vigorous growth. The reasoning is that warm whites don't emit much blue light, which the plants use for photosynthesis and to regulate their growth. The cool white bulb supplies the blue light.
My call for your unit would be to use several (three to five) CFLs with a total input of between 120-160 watts. Although the 150 watt HPS is a bit more efficient that the CFLs in total output, watt for watt the fluorescents provide as much useful light as the HPS lamp. Heat is another consideration. The HPS runs much hotter and emits more heat than the fluoescents.
Make sure to use reflective material around the garden so that any light escaping the garden is reflected back to the plants. Any light that doesn't get to the plant leaves is wasted.
Look at a lumen/watt ration of various CFL's. The higher the wattage of CFLs, the lower the lumen/watt ratio. This chart was submitted by Jerry Garcia, of RIU and edited for typos.
For example...
the 200w listed at 9250 lumens for a lumens/watt ratio of 9250/200=46.25
the 150w is listed at 7500 lumens for a l/w ratio of 7500/150=50
the 125w is listed at 6500 lumens for a l/w ratio of 6500/125=52
the 42w are listed for 2700 lumens, l/w ratio of 2700/42=64.28
I have some 26w that give off 1700 lumens for a l/w ratio of 1700/26=65.38
GE lists some 13w that give off 825 lumens for a l/w ratio of 825/13=63.46
So, according to these numbers the most efficient bulbs for growing are the 26w that emit 1700 lumens. If you used 8 26w bulbs (208 watts total) you'd be getting 13,600 lumens...4,350 more lumens than a single 200 watt cfl.
I suppose you need to purchase more sockets and cords and things to support 8 bulbs, but in the long run more lower watt CFLs seem like the way to go.
__________________
Roseman
Elite Rolling Society
CFLs vs HID Lights
If you want to start an arguement fast, then visit an Internet Grow Forum or Chat Room and mention CFLs vs HID Lights.
Let me just tell you a fact. HID Lights (High Intensity Discharge Lights) are much more efficient than CFLs (Compact Flourscent Lights) and they grow FASTER and penetrate a large plant much better than CFLs do. HID lights grow tighter denser buds too. That is a fact no one should argue. HIDs win easily.
Wait a minute. What costs more to purchase? What requires a fancier Reflector and costs more to hang? What cost more to use and adds more to the electric bill? What cost more to handle the HEAT?
HEAT? I can touch a 200 watt CFL for ten seconds and not burn my hand. I can hold a burning 42, 65, or 85 watt bulb in my hand for five seconds and not get burnt. I can touch a HID bulb for half a second and have a serious blister and burn. Touching a HID bulb is like touching the burner on an electric stove. If you use HID bulbs, not only will you have to cool the bulb, you will have to cool the grow area too. Growing with HID lights requires VENTING the HEAT, and that cost extra money.
If you are a large scale grower, or commercial grower, HID lights are best for you.
If you are a small grower, a closet or tent grower, then CFLs are your best, easiest, cheapest way to grow.
As I mentioned, I like the cheaper CFLs because of their mobility and ease of use and NO Need to VENT Heat..
When I did my first grow three years ago, a 65 watt CFL was the largest made and sold. Today I see up to 300 watt CFLS, but I do not advise using the larger watt CFL bulbs.
If you want to start an arguement fast, then visit an Internet Grow Forum or Chat Room and mention CFLs vs HID Lights.
Let me just tell you a fact. HID Lights (High Intensity Discharge Lights) are much more efficient than CFLs (Compact Flourscent Lights) and they grow FASTER and penetrate a large plant much better than CFLs do. HID lights grow tighter denser buds too. That is a fact no one should argue. HIDs win easily.
Wait a minute. What costs more to purchase? What requires a fancier Reflector and costs more to hang? What cost more to use and adds more to the electric bill? What cost more to handle the HEAT?
HEAT? I can touch a 200 watt CFL for ten seconds and not burn my hand. I can hold a burning 42, 65, or 85 watt bulb in my hand for five seconds and not get burnt. I can touch a HID bulb for half a second and have a serious blister and burn. Touching a HID bulb is like touching the burner on an electric stove. If you use HID bulbs, not only will you have to cool the bulb, you will have to cool the grow area too. Growing with HID lights requires VENTING the HEAT, and that cost extra money.
If you are a large scale grower, or commercial grower, HID lights are best for you.
If you are a small grower, a closet or tent grower, then CFLs are your best, easiest, cheapest way to grow.
As I mentioned, I like the cheaper CFLs because of their mobility and ease of use and NO Need to VENT Heat..
When I did my first grow three years ago, a 65 watt CFL was the largest made and sold. Today I see up to 300 watt CFLS, but I do not advise using the larger watt CFL bulbs.
Where in the hell am I?
Well-Known Member
This is just as good as a parabolic reflector:
https://www.rollitup.org/do-yourself/158047-diy-reflectors-fer-cfl-lights.html
https://www.rollitup.org/do-yourself/158047-diy-reflectors-fer-cfl-lights.html
Where in the hell am I?
Well-Known Member
By the way, I am gonna be checkin to see if Roseman's theory is right! Dont mean to hi-jack. . .
My previous CFL grows have been rather well done:
https://www.rollitup.org/cfl-growing/146691-new-cfl-grow.html
https://www.rollitup.org/cfl-growing/158427-some-cfl-bud-porn.html
My next CFL grow is going to be only 3 plants w/the 200W CFL. If Roseman is right, this will be the only grow using the 200W
, if he is mistaken, the next grow will have 3 200Wer's
However, Roseman is pretty damn sharp, so we shal see. . .
My previous CFL grows have been rather well done:
https://www.rollitup.org/cfl-growing/146691-new-cfl-grow.html
https://www.rollitup.org/cfl-growing/158427-some-cfl-bud-porn.html
My next CFL grow is going to be only 3 plants w/the 200W CFL. If Roseman is right, this will be the only grow using the 200W
, if he is mistaken, the next grow will have 3 200Wer'sHowever, Roseman is pretty damn sharp, so we shal see. . .