The YELLOW/AMBER T-5 tubeguard is one of the most popular tubeguards becasue of it's many uses. The most common is it's use to filter the section of the lighting spectrum that attracts bugs. Typically used outdoors, this same tubeguard also goes by the name Bug Yellow, Amber, Gold, and Orange. As with other colors, the lamp used inside the tubeguard can affect the projected color. Warm lamps make it darker, cool lamps make it lighter. For use on F28 lamps, not for use on F54 high output lamps.