How brightly does the Glo-Mega glow?
In intermediate levels of lighting, the Glo-Mega takes on a greenish color as the glow competes with the light from its surroundings. In dark conditions, the Glo-Mega’s glow has been measured at 1220 mcd/m2 immediately after charging and, after ten minutes, was still 45 times as bright as required by ASTM 2073 for emergency signage.