Benu BRIOLETTE: LUMINOUS NEONThis pen glows beautifully in a dark and semi dark with a lime green color after an hour exposure to light. Please accept variations in duration of glowing depending on exposure time to light, and the intensity of the light source. There are different light sources you can use for charging the pen to glownatural sunlight, regular desk lamps, or LED lamps. Usually, LED lights produce a weaker glow compared to sunlight and traditional incandescent