In fact, dimming below 50% of rated power may reduce high pressure sodium and metal halide lamp life by 90%. As a result, dimming below 50% may void lamp warranties. The National Electrical ...

ABSTRACT Comparison of Intracanopy Light-emitting Diode Towers and Overhead High-pressure Sodium Lamps for Supplemental Lighting of Greenhouse-grown Tomatoes Celina Gómez, Robert C. Morrow, C. Michael ...

The researchers concluded that use of rotating high-pressure sodium lamps could be effective in commercial production as long as the light intensity is above the recommended value.

The experiment used four popular flowering ornamentals (campanula, coreopsis, petunia, and rudbeckia) to compare the efficacy of a rotating high-pressure sodium lamp (HPS) in promoting flowering ...

In the search for superconductors, finding ways to compress hydrogen into a metal has been a point of focus ever since scientists predicted many years ago that electricity would flow, uninhibited, ...

When Chicago's high-pressure sodium lights are replaced with LEDs, the city will lose its distinctive orange glow. Maybe it's for the best.