High pressure sodium vapor bulb.
The most efficient currently available light sources are arc-discharge lights. The most efficient of all are low-pressure sodium vapor bulbs, but they give a very strongly yellow light that most people don't much like, perhaps because it makes everyone look dead. High pressure sodium lights improve the color somewhat, though they are still distinctly yellow.
This high pressure sodium bulb is sold as a "grow lamp" which means it has a spectrum well suited to encouraging plants to grow. At 1000W, this bulb is large enough to encourage a lot of growing!
This bulb is displayed in my Bulb Stand.
Source: Auction
Contributor: Theodore Gray
Acquired: 28 November, 2003
Price: $1
Size: 12"
Purity: <1%
Sample Group: Light Bulbs
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