A useful post I Think on PAR, Lighting, CRI & Color Temperature

2255 Views 6 Replies 3 Participants Last post by R_Barber001, Oct 1, 2012

Steve001

Discussion Starter · Sep 30, 2012

here's the link
http://www.rollitup.org/newbie-central/439701-all-about-lighting.html
Excerpt:

Im gonna compile a list of bulbs that are great for growing, so keep your eye out for it below
Natural sunshine is 100 CRI & 5300K at peak

Vegging CFL Bulbs

BlueMax Full Spectrum HD CFL Bulbs: 5500k, CRI 93+
BlueMax Full Spectrum HD CFL Bulbs: 5900k, CRI 93+
Indoor Sunshine Full Spectrum CFL Bulbs: 5300k, CRI 95
Duro-Test Color Classer 75: 7500k, CRI 93
Duro-Test Daylight 65: 6500k, CRI 92
Duro-Test Vita-Lite: 5500k, CRI 91
Duro-Test Vita-Lite Plus: 5500k, CRI 91 (higher lumens)
Duro-Test Optima 50: 5000k, CRI 91
Duro-Test Color-Matcher 50: 5000k, CRI 90
NaturesSunlite: 5000k, CRI 85
NaturesSunlite: 6500k, CRI 85
NaturesSunlite Full Spectrum: 5500k, CRI 93

Vegging Fluorescent Tubes

Sylvania Gro-Lux GRO/AQ (these dont have specs, but are great for growing)
Sylvania Gro-Lux Wide Spectrum: 3400k, CRI 89
Verilux Tru-Bloom Full Spectrum: 6280k, CRI 94.5
AgroSun Full Spectrum: 5850, CRI 93
BlueMax Full Spectrum HD: 5900k, CRI 93+
BlueMax Maxum: 5000k, CRI 91+
BlueMax Prolume: 6500k, CRI 91
BlueMax Spectra: 5500k, 5600k, 5900k, CRI 93
Duro-Test Vita-Lite: 5500k, CRI 91
NaturesSunlite: 5500k, CRI 93
NaturesSunlite: 5500k, CRI 96

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1 - 7 of 7 Posts

There is good information in that article, but it does totally ignore the effect of distance from a light source in determining how much light it gives you. And, it over emphasizes CRI, which isn't of much value for judging planted tank lights. It also repeats the incorrect information that plants use only blue and red light, not yellow and green. Plants use light from the whole PAR range of wave lengths, using different pigments to absorb the various wave lengths.

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Steve001

Discussion Starter · #3 · Sep 30, 2012

This article is a good starting point. Any erroneous or missing info can be corrected or added.

I found it's pasted from this site
https://www.thcfarmer.com/community...-a-lot-of-other-lighting-spectrum-info.37783/

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Hoppy

· #4 · Oct 1, 2012

This statement, "Lumens is a measure of light flux, so is independent of the area. It is essentially the amount of light available. So think of a bright light. It has a fixed amount of lumens, regardless of how near or far you are from it." isn't correct. Lumens is not a measure of flux, which is energy per unit area. Lumens is a measure of the total light emitted from a source. Lux is the measure of flux, or how much light energy passes through a unit area per unit time.

I think this article was written for terrestrial farmers, who use artificial light - I can't imagine what crop would be grown that way???? (Unless it is a competitor for tobacco.)

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Steve001

Discussion Starter · #5 · Oct 1, 2012

Hoppy said:
This statement, "Lumens is a measure of light flux, so is independent of the area. It is essentially the amount of light available. So think of a bright light. It has a fixed amount of lumens, regardless of how near or far you are from it." isn't correct. Lumens is not a measure of flux, which is energy per unit area. Lumens is a measure of the total light emitted from a source. Lux is the measure of flux, or how much light energy passes through a unit area per unit time.

I think this article was written for terrestrial farmers, who use artificial light - I can't imagine what crop would be grown that way???? (Unless it is a competitor for tobacco.)

Perhaps this one

I think you are right that it targets terrestrial farming.

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