4 ms·

”UltraGlow® powders are a new generation phosphorescent material with an astonishing glow time as long as 30 hours!”

• CodeMage 4y ago
  It "recharges" when exposed to light.
• genewitch 4y ago
  and the "glow time" is only to a value of .32mCd, which is, per their copy, "100x more luminescent than necessary to see with the naked eye" so more than 30 hours after being charge for 5 minutes in the sun.