High Pressure Sodium Lighting

sacramonel

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I have read that high pressure sodium lighting was excellent for plant growth. I was wondering if anyone has had any success with them for Aquarium Plants?
 
This comes form an article by Richard J. Sexton at http://www.geocities.com/CapeCanaveral/4742/lighting.html

Sodium vapor lamps
These lamps come in two varieties, high pressure sodium and low pressure sodium, although this is rather a moot point, as the light they output is monochromatic (pure) yellow, and is all but useless in terms of aquaria. It's rather a shame, as they are a full ten times more efficient then incandescent bulbs, in fact these are the most efficient bulbs made, and have a 24,000+ hour lifespan. These are one of the cheapest HID bulbs to purchase, and can be found in most hardware stores for around $80 for bulb and ballast. Spare bulbs are around $30. Recent advances in high pressure sodium bulbs such as the Philips "Sun Agro" have improved output spectra, and are quite popular for terrestrial plants, although they haven't as yet gained great acceptance with aquatic gardeners.
 

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