LPS vs HPS and LED NASA

K

kindprincess

Well-Known Member
cannabis is not close to lettuce or wheat; i do not think it ideal for our methods.

there are reasons that mh and hps are the two main lighting sources for indoor gardens. just as mercury vapor phased out, replaced by mh.
 
Moon Shadow

Moon Shadow

Well-Known Member
Found this too
*Low Pressure Sodium lamps have a very narrow color spectrum,
*but they may be used for "side lighting".
 
Moon Shadow

Moon Shadow

Well-Known Member
I was wrong

Low Pressure Sodium (LPS)

Low-Pressure Sodium are available most often in low wattages; although their lumen-to-watt output is the highest of any lamp, they function on a very narrow band on the yellow color spectrum which provides limited use to growing plants. While LP sodium lights maintain 100 percent of their lumen output throughout their life spans, they must be used, if at all, with an MH lamp to stimulate photosynthesis. Most indoor gardeners highly recommend HPS over LPS lamps.
 
TheDankness

TheDankness

Well-Known Member
That presentation was referring to low pressure systems, not low pressure sodium. They are testing the effects of growing plants in a low pressure environment, like on mars, or a complete vacuum like on the moon. It had nothing to do with low pressure sodium lights, nothing at all.
 
OregonMeds

OregonMeds

Well-Known Member
I don't have the patience to sift through that article either, but I looked at the pictures does that count? :)


I want this room:
 

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R

Rollman Smokanski

Member
Also, the "wrong LPS" pdf reference above does have a very interesting table on page 20 about what the Red and Blue LED emissions do for the plant, reproduced here:

Red: Photosynthesis, Phytochrome
Blue: Photomorphogenesis, Phototropism, Stomatal Control
Green: Human Vision, Canopy Penetration ?

The emission lines of LPS would be closest to Green, pretty for us, but only at best a helper light for the plant.
 
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