Facts of Light by Dr. Sanjay Joshi, Ph.D.

[LJB]

Dr. Joshi's series is a great starting point for anyone that is still thinking in terms of watts, lumens, kelvin, CRI and any other measurements of light that plants do not understand.

His stuff is very well written and relatively easy to understand. It's clearly aimed at someone like me that struggled with math and natural sciences in high school.

Part I: What is Light?

Part II: Photons

Part III: Making Sense of Light Measures

Part IV: Color Temperature

Part V: Everything You Need to Know About Metal Halide Lamps and Ballasts

see also:

Here I will present all the spectral and performance data for all the Metal Halide lamps I have tested since 1998. (Sanjay's Reef Lighting Guide)

If one searches for Joshi's name, many other articles can be found posted at various reef sources.

***

And for people that want to go beyond even PPFD:

Daily Light Integral Defined, by Eric Runkle

Source: Greenhouse Product News November 2006

Daily Light Integral: A useful tool for the U.S. Floriculture industry, by James E. Faust

Source: specmeters.com

STRATEGIES FOR A CONSTANT DAILY LIGHT INTEGRAL IN GREENHOUSES

Authors: I. Seginer, I. Ioslovich, L.D. Albright
Source: Actahort.org

 

[ureapwhatusow]

nice

 

[Rysam]

Sanjay is a lighting god. I've met him on several occasions at reef geek conventions and he knows his shit!!!
His bulb comparisons are an invaluable resource.

 

[ureapwhatusow]

you take the good you take the bad you take em both and there ya have the facts of light the facts of light

 

[oldgrayhair]

you take the good you take the bad you take em both and there ya have the facts of light the facts of light

Have you seen Tootie lately? ! I'd hit it!

-ogh

 

[*mistress*]

nice tech data contribution...

*edit*
empty link:
Here I will present all the spectral and performance data for all the Metal Halide lamps I have tested since 1998.

enjoy your garden!

 

[LJB]

you're welcome mistress, that's been fixed.