looks like after this grow i might be invisting in a 400W HPS to compensate :-D

thanks everyone

Nobody mentioned a static horizontal bulb cept you.
There are two members here that I know of(maybe more)
that have pulled 2.0g/w, as has the old man.
1.8g/w is my best ever, with 1.1 -1.5 being sort of normal with
the right indica.

I assumed that was the manner in which the OP is growing since they did not saying they were using a mover, or a vertical setup. The VAST majority of grows are done static and horizontal, so to keep things comparable (apples to apples) that's what I was basing my numbers on.

For you to say, "I can do twice that" but with the intent of doing that under a style of growing which will utilize twice the canopy doesn't really say anything.

One can get 900 grams from a vertical 400w HPS on a mover covering two vertical scrogs, but that's not really relevant to this thread. And I wouldn't expect to get half that with an MH.

In fact everytime I've added MH throughout the entire flower cycle, my overall grams per watt has been slightly reduced. And it makes sense, blue light costs more watts to make than red. And the plant has an easier time making bud from red light anyway.

These Are what I Like To Flower Under Or Beside..
EYE LIGHTING INTERNATIONAL
OF NORTH AMERICA, INC.
A SUBSIDIARY OF IWASAKI ELECTRIC CO., LTD
HORTILUX SUPER HPS EN™ High Pressure Sodium Lamps

LU250S/HTL/EN - NOW AVAILABLE!!! LU400S/HTL/EN LU430S/HTL/EN LU600S/HTL/EN LU1000B/HTL/EN

• Provides 25% more energy in Violet, Blue and Green spectrum than standard High Pressure Sodium
• The combination of Super HPS and the Metal Ace conversion lamp provides the optimum spectral energy levels through all stages of plant growth
• EN designation means environmentally friendly in that the lamp pass EPA, TCLP test criteria as non-hazardous waste. For more information about environmentally friendly lamps click here

Technical Bulletins LU250S.HTL/EN LU400S/HTL/EN LUR400S/HTL LU430S/HTL/EN LU600S/HTL/EN LU1000B/HTL/ENLampANSI
CodeInitial
LumensMOL*Dia.*Hours
LifeLU250S/HTL/EN S5030,5009.750 2.25024,000LU400S/HTL/ENS5155,0009.7502.25024,000LUR400S/HTL/ENS517,500 Lx**12.4437.08724,000LU430S/HTL/ENS14558,5009.7502.25016,000LU600S/HTL/ENS10688,00010.4722.25016,000LU1000B/HTL/ENS52145,00015.0623.12524,000*MOL/ Dia. shown in inches **Center beam illuminance at 1 meter

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Yep, the eye's have it. Especially with a digital ballast.

my 2 cents.
Buy the mh bulb with the enhanced red spectrum.
Best of both worlds
As for investing in a 400w hps, get a 600w hps electronic ballast(that's another 2 cents)

Don't forget to get a UVB bulb to if you want those fatter buds

Mega-Ray SB 160 watt Self-Ballasted Flood UVB Lamp

__________________

Fear is the only darkness that exist

I remember reading somewhere that increasing uv rays the last 2 weeks of flowering increases potency as well.

UVB are used threw out the entire grow cycle with great success by some.
UVB are supplemental to HPS

__________________

Fear is the only darkness that exist

I am curious under what mechanism you believe UV-B will cause the buds to grow to a larger size.

I understand the plant has UV-B photo receptors, which will increase resin production upon receiving UV-B light, in order to protect the plant with its version of sun screen in the form of trichomes. But I believe the added stress from the UV-B will if anything reduce yield, at a certain point, probably at the point where you surpass the amount of UV-B supplied by the sun.

First off, if you are using this exact lamp you are doing more harm than
good.
This lamp and almost every lizard lamp out there now, also gives UV-A
and doubles as a heat lamp.

UV-A = good for lizard and saltwater aquarium plants (in SMALL amounts).
UV-A = in larger amount is deadly to life,..all life.

Back in the day, you could buy UV-B lamps everywhere from 20w
and up.
Now the only true UV-B lamps I can find are suntan lamps, no UV-A
and no heat. Big coin though..

thanks for all the help and suggestions on this one everybody.

i ended up going with 400w of CFL side lighting to supplement my overhead 400w MH lighting and i do believe in the few days it has been lighting the room so far has made a huge difference. i just need to control heat/humidity over these next few HOT HUMID mid-atlantic days.

__________________


First Grow: Bag Seed
http://www.greenpassion.org/f15/buying-vs-trying-13054/

"Such holidays in the sun don't come without sacrifices"

UVB Output of Various Bulbs (microwatts/cm²)
Bulbtype UVBrating UVArating DistanceFromBulb

T-Rex Active UVHeat
SB 100-WATT FLOOD LAMP 150-294 ? 1'
SB 100-WATT FLOOD LAMP 100-150 ? 20"
SB 160-WATT FLOOD LAMP 250-300 ? 18"
SB 160-WATT FLOOD LAMP 75 - 150 ? 2'

MEGA-RAY mercury vapor lamps
60 watt
(does not produce heat) 250-300 ? 1'
60 watt
(does not produce heat) 125+ ? 4'
SB 100-WATT FLOOD LAMP 150-250 ? 1'
SB 100-WATT FLOOD LAMP 100-150 ? 20"
SB 160-WATT FLOOD LAMP 250-300 ? 18"
SB 160-WATT FLOOD LAMP 75 -150 ? 2'

Zoo Meds Powersun UVHeat
60 watt
(does not produce heat) 85 640 1'
60 watt
(does not produce heat) 65 48 2'
flood 100w 50 400 1'
flood 100w 12.5 110 2'
flood 160w 85 640 1'
flood 160w 65 480 1.5'
flood 160w 25 320 2'
flood 160w 11 142 3'
flood 275w 66 720 2'
flood 275w 48 520 2.5'
flood 275w 30 320 3'
flood 275w 20 180 4'
spot 100w 100 1700 2'
spot 100w 70 1130 2.5'
spot 100w 40 562 3'
spot 100w 30 400 4'
spot 160w 137 1500 3'
spot 160w 100 1200 4'

Capture The Sun Mercury Vapor Bulbs
flood 100w 107 400 30cm (~1')
flood 160w 157 640 30cm (~1')

ESU Super UV Coil Lamp
13 watt 3 14 ?
20 watt 3 14 ?

SunSeeker
160 watt flood 2 ? 6"

Fluorescent Lights
Reptisun 5.0 10 23 1'
Iguana Light 5.0 10 23 1'
Reptisun 2.0 4 12 1'
Sun Seeker 8.0 3 ? 1'
ESU Super UV Reptile
Daylight Lamp 3 7 ?

Natural Sunlight
equator 265 ? ?
Illinois 256 ? ?
Texas 220 ? ?

South Carolina
11/22/04 @12:00pm 220 full sun
South Carolina
1/1/05 @12:30pm 112 partly cloudy
South Carolina
2/01/05 @12:30 156 full sun

As you can see, the data is not complete so feel
free to add on or update with any info you may have.
New lamps comming out all the time...

"UVA, UVB and UVC can all damage collagen fibers and thereby accelerate aging of the skin. Both UVA and UVB destroy vitamin A in skin which may cause further damage. In the past, UVA was considered less harmful, but today it is known that it can contribute to skin cancer via indirect DNA damage (free radicals and reactive oxygen species). It penetrates deeply but it does not cause sunburn. UVA does not damage DNA directly like UVB and UVC, but it can generate highly reactive chemical intermediates, such as hydroxyl and oxygen radicals, which in turn can damage DNA."

Watch from 11 min onward

__________________

Fear is the only darkness that exist

So i have a 400W MH setup running currently.

Picking up a 450W HPS/MH setup today.

Should i run them concurrently for the entire grow to maximize space?

Or just run the MH for Veg an the HPS for flower?

Or should i run 2 MH bulbs for veg, 1MH/1HPS for flower?

WHat are some of ur suggestions?

__________________


First Grow: Bag Seed
http://www.greenpassion.org/showthread.php?t=13054

"Such holidays in the sun don't come without sacrifices"