The WL-1860245 series from Wamco, Inc., consists of BA9S base LED bulbs available in a variety of colors, designed specifically for 28V applications. These bulbs are commonly used in aircraft lighting systems, where the 28V DC power supply is standard. If you're working on avionics or general aviation projects, these bulbs are a go-to solution due to their reliability and color consistency across different units.

One thing worth noting is the importance of ensuring proper current limiting when using these bulbs. Without adequate current limiting, the LEDs could overheat and fail prematurely. Engineers tend to reach for these bulbs when they need a high-quality, long-lasting light source that can withstand the rigors of an aircraft environment. They are also popular in other 28V systems such as RVs, boats, and industrial equipment, where compact, efficient lighting solutions are needed.