This glow tape is great for Halloween. After exposing it to natural or artificial light, it will glow in the dark for up to 10 hours with the glow fading over time until the next recharge. This neon green fluorescent tape is great for luminous safety lighting in the dark in your home or on stage. It is photoluminescent, which means that it appears flourescent green, emitting glo -like photons to the immediately surrounding area. The luminescent qualities can be used to mark exit signs or other landmarks indoors or to light up games for fun outdoor night activities.