The light output of high-pressure gas discharge lamps a […]
The light output of high-pressure gas discharge lamps and metal halide lamps is continuously reduced after installation, but for practical reasons, once the light output begins to drop, they cannot be replaced.
“High-pressure gas discharge lamps and metal halide lamps, once replaced, are typically 50% lower than the original light output, which means they provide much lower levels of illumination than their original design and usually produce a focus effect,” Sachetti said.
"In contrast, today's LEDs have a lumen maintenance rate of over 95% after 60,000 hours, enough to maintain nighttime lighting levels of more than 14 years."
