We tested several green LED bulbs as suitable replacements for the clearance lights on our helipads. These lamps were by far the brightest we tested; They can be seen from miles in the air. The bulbs are encased in colored glass (green) and these green bulbs emit bright, high-intensity light through the colored glass. The light's body is water and weather resistant, but I'm pretty sure the bulbs are susceptible to moisture. no problems so far. They work great in both 20 degree weather and 75 degree weather. These bulbs are a little blue-green compared to other brands, but still a vibrant, impressive, rich green. I cannot confirm the durability of these lamps as they last less than a year. The only downside for helicopters is that these lights cannot be seen with night vision goggles, unlike older incandescent lights that generate a significant amount of heat.
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