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article on lighting version 2

I posted a new version of my article on lighting for planted
aquaria at http://www.aquabotanic.com/lightcompare.htm

It is a much improved version over the former one. Some of the 

- a  new section explains some of the terminology.
- additional ligth bulb types: MH, HPS, MV, VHO, halophospors
- standard PAR units are used thoughout. 
- all spectra where re-digitized and measured with a semi-automatic procedure.
- more comprehensive analysis and a real-life example.
- includes plots of all spectra in standard PAR units.

Enjoy !

- Ivo Busko
  Baltimore, MD