The Edwards 49 Series AdaptaBeacon flashing lights are designed to provide a bright visual indication utilizing special optics within a shatter resistant polycarbonate lens. The polycarbonate double fresnel lens ensures efficient light dispersion. This is accomplished with a series of complementing fresnels that cause the dome to "fill" when the light is operating. Beam distance is also increased with fresnel lenses. Lenses are available in six colors: red, amber, blue, green, magenta, and clear.