The efficient blue crystal will not degrade night vision. Can be clipped to keys, jacket, or purse Blue Sapphire Beads Choker with Long Haram | American Diamond | Asp The Brilliant Blue crystal provides a high efficiency, non-deteriorating solid state beam which provides soft illumination visible for over one mile. Blue LED Keychain Light ASP 53050 Sapphire Microlight, Blue | Qzrk38gqow8z Asp 53050 Sapphire Microlight Blue Color Code ASP L530 COL.02 - Eyespace A lifetime of light where and when you need. The blue Sapphire Crystal produces a high efficiency,non-deteriorating,solid state beam. It provides soft illumination with a 180 degree viewing radius that is visible over one mile
