Response from: Carl Strohmeyer

This was an interesting article, especially as it pertains to LED and CFL lights. Two aspects of lighting that were missing were SHO compact Fluorescents which put out 500 + watts of lumination for 100 watts of energy. The 6400 K versions are growing in popularity in the aquarium trade for relatively simple and inexpensive alternative to large specialty fixtures and bulbs to produce the same.
The other new innovation is LED with similar outputs to more conventional Metal Halide with much less heat and space (currently price is the problem here).

Response from: Phil Gerbyshak

Awesome Carl. I wasn't aware of these. Thanks so much for sharing your feedback and additional insights. It's very appreciated!