The total amount of light emitted by a source (The "Output"). Lux: How much light hits a specific surface (Metric). Foot-candles: How much light hits a square foot (Imperial).
Are you optimizing for , home office productivity , or gardening ? Do you need help choosing specific bulb wattages ? Light Levels
Apps like Lux Light Meter use your phone's front camera to provide a surprisingly accurate estimate. The total amount of light emitted by a source (The "Output")