defined in eye safety specifications such as ANSI/IESNA RP-27.1–05: Recommended Practice for Photobiological Safety for Lamp and Lamp Systems. [94] [95] Electrical Polarity :  Unlike  incandescent  light bulbs, which illuminate regardless of the electrical  polarity , LEDs will only light with correct electrical polarity. Blue pollution:  Because cool- white LEDs  (i.e.,