MH vs HPS in flower

[Xsmoker]

Being a noob, this has probably been talked about but I did a search and didn't see anything concrete.

I have alot of hours on my HPS so I decided to do a run all the way thru with a MH bulb and a couple CFLS here and there. I will get a new HPS next time around.

But for what it's worth, how much less plant mass (budz) will one realize by flowering in MH vs. HPS. 10%, alot, alittle, I have no clue, etc.

Thanks a bunch in advance. I'm getting my new camera soon so I'll guess I'll post some pics later.

X.

 

[sunnyside]

thats a really good question xsmoker...

some info I found for ya...

Information about Lamps

The plant sensitivity curve for photosynthesis has its peak at the red end of the spectrum (675nm) (McCree).

This chart indicated that providing plants with the wavelengths best suited to photosynthesis, is the most efficient use of artificial light. Tests show a mean deviation from the average sensitivity curve of less than 5% for a wide variety of plants. The curve shows that the maximum sensitivity for photosynthesis lies in the far red at approximately 675 nm.

The plant sensitivity curve disputes two common misconceptions. The first is that an "ideal" plant growing lamp duplicates the spectral energy distribution of the sun. Sunlight has a continual spectrum, radiating energy in wavelengths that contribute less to photosynthesis, and are therefore "wasted" on the plant. For this reason, many lamps are more efficient than sunlight for plants.

Which Lamp is Best for Your Growing Needs?

Metal Halide Lamps – This type of light is blue-orientated in the spectrum. It's the best type of light to be used as a primary light source (if little or no natural sunlight is available). This type of lamp promotes plant growth.

High Pressure Sodium Lamps – These lamps are red/orange in the spectrum. They are the best lamps available for secondary or supplemental lighting (used in conjuction with natural sunlight). This type of light promotes flowering/budding in plants. It's ideal for Greenhouse/Commercial growing applications.

1. METAL HALIDE LAMPS - This type of light is blue-orientated in the spectrum. It is the best type of light to be used as a primary light source (if no or little natural sunlight is available). This type of lamp promotes plant growth.

2. HIGH PRESSURE SODIUM LAMPS - These lamps are red/orange in the spectrum. They are the best lamps available for secondary or supplementary lighting (used in conjunction with natural sunlight). This" type of light promotes flowering/budding in plants. It is ideal for Greenhouses/Commercial growing applications.

I don't know what the yield difference would be...maybe someone else can chime in with that. My guess is that it would drop a little bit, but not much!!

 

[Father Time]

G'Day,
there are duel Spectrum M/H Globes you can purchase,thay have the ability to promote both vegation and Flowering.
Kind Regards,Father Time.

 

[nycnoob]

well hmm.. i dont know what the difference would be also.. what type of cfls are you using.. if you are using warm 2700k and less than 25 watts you can pretty much put it within two inches of the bud and get great results as indicated from Biglougrew.. the 2700k gives the buds a more compact and tight formation while I hear the MH's get more flufflier buds..but once again I dont know the difference of the bud mass