universetoday.com
LEDs: Light Pollution Solution or Night Sky Nemesis? - Universe Today
You may have noticed a change underway in your city lighting. High pressure sodium lights, with their familiar orange glow, are quickly being replaced by new, energy efficient blue-white LED (light emitting diode) lighting. Is this the beginning of a new assault on the night or an opportunity to use light more wisely? Many of … Continue reading "LEDs: Light Pollution Solution or Night Sky Nemesis?"