200$ bucks too spend and torn between led and t5 type

Led or T5?

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Coverage is the amount of area you can cover. PAR is the radiation intensity the plant can use, in micromols, in a square foot or meter? I forget. PPFD and the other one and all that shit. But you get it.
 
Olive Drab Green said:
He's wrong. It also increases PAR intensity as the lights overlap, as long as their dispersion patterns overlap along some kind of edge of each.
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He is still stuck in lumens instead of photons so the logic is warped

LUMENS MEAN ABSOLUTELY NOTHING TO PLANTS it is a measurement of how bright a light source is to humans

Think of photons as bullets and the lights as machine guns, 2 will always blow up more shit than one
 
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TacoMac said:
Which is exactly what I said. You're adding more coverage (which is what PAR and lumens are) to the mix, but not more wattage. It's simply more effective lighting of that wattage.
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I'm thinking of getting the fixture local and maybe ordering some higher end bulbs any suggestions. It's a high bay 4×2 btw.
 

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RM3 said:
He is still stuck in lumens instead of photons so the logic is warped

LUMENS MEAN ABSOLUTELY NOTHING TO PLANTS it is a measurement of how bright a light source is to humans

Think of photons as bullets and the lights as machine guns, 2 will always blow up more shit than one
Click to expand...
He did specifically say about "the eye test." Problem is, the spectrum the plant picks up is less than what the eye picks up. Needs to be narrowed to be understood.
 
Olive Drab Green said:
PAR is not coverage, it's intensity. There's a difference.
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Then you define it completely differently than the entire scientific community.

The number after PAR or MR indicates the diameter of the face of the lamp, expressed in 1/8ths of an inch.

In other words, an MR16 is 16 x 1/8 inches, or 2 inches in diameter.

A PAR20 is 20 eights-of-an-inch in diameter, or 2.5 inches.

A PAR38 is 38 eights-of-an-inch, so it is 4.75 inches in diameter.
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http://lumicrest.com/par-mean/

By adding more bulbs, you by default increase the PAR (the SIZE/Coverage) of a given wattage.
 
TacoMac said:
Then you define it completely differently than the entire scientific community.



http://lumicrest.com/par-mean/

By adding more bulbs, you by default increase the PAR (the SIZE/Coverage) of a given wattage.
Click to expand...
Wrong PAR

Photosynthetically Active Radiation (PAR) is measured by a silicon photovoltaic detector. This detector measures light in the 400 nanometer to 700 nanometer range. Some PAR sensors measure the PPFD of photosynthetically active radiation. PPFD stands for photosynthetic photon flux density and is used to quantify PAR.
 
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