10.5W / 10.5A19: Refers to a 10.5-Watt energy draw. In LED terms, this typically delivers 1100 lumens of brightness, making it a 75-Watt incandescent equivalent. A19: Refers to the physical shape and size. The letter "A" designates the standard pear-shaped household bulb, while "19" indicates the diameter at its widest point (19/8ths of an inch).27K: Refers to 2700 Kelvin, which is the Soft White color temperature. This provides a warm, cozy light similar to classic incandescent bulbs, making it ideal for bedrooms and living rooms.