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Probably the best, most researched, and regularly updated Aquarium Lighting Article is:
Aquarium LightingThis article not only has many years of aquarium maintenance experience going into it, but it it has many references cited which are regularly checked/updated for accuracy (which is important since what was true about aquarium lighting two years ago is not necessarily correct today due to fast increasing technologies (sadly from emails I know that many self appointed experts cannot seem to grasp)This article contains these sections:

1. Aquarium Lighting Basics
2. Kelvin Rating
3. Nanometer Range (Spectrum)
4. Lux
5. PAR (Photosynthetically Active Radiation)
6. Useful Light Energy (PUR)
7. Lumens
8. Watts
9. CRI
10. Aquarium Light Type
    • T-2
    • T- 5
    • T-12 & T8
    • CFL
    • SHO
    • VHO
    • Metal Halide
    • LED
    • Lunar/Moonlighting (Moon Lights)
    • Induction
    • HID Xenon etc.
     
11. Parameters
12. Watts Per Gallon Comparison
13. Light on time & change
14. Lamp placement
15. Specimen Placement
16. Tank Set Up Suggestions
17. Summary
18. References