Ocubulb Blue Light Blocking Bulb (E27 for Africa, Asia, Europe, Oceania)For Use in Africa, Asia, Europe, Oceania, and other countries with 220 240V electrical systems. NOT FOR USE IN NORTH AMERICA. Fits E27 Socket (this is the same socket as in a household lamp) For General Purpose Lighting; Use at Home or Office Emits Energy from 500nm 650nm Predominant Wavelength: 550nm Flicker Free LED Bulb A+ Energy Efficient, Bears CE Mark Developed by Optometrists Manufactured by Ocushield Not Eligible for Expedited Shipping Not