Today's low-pressure sodium lamps give close to 200 lpw, the most energy efficient light source commercially available. This lamp was made for street-lighting use by (U.S.) General Electric around ...

Rotating high-pressure sodium lamps provide flowering plants for spring markets Intermittent light system more cost-effective than incandescent illumination Peer-Reviewed Publication ...

“Using these assessment metrics,” the authors state in their paper, “filtered yellow‐green and amber LEDs are predicted to have lower effects on wildlife than high-pressure sodium lamps ...

For almost two generations of Chicagoans, orange has been the color of night. High pressure sodium vapor lights, which create a glow reminiscent of a tire fire, have lit Chicago since the 1970s. Th… ...