- Watt: the end power output of a light source
- Lumen: total visible light output of a light source
- Lux: the amount of visible light falling on a surface
Watts & Lumens
It is a common misconception that the higher the wattage the higher light output. With LED lighting, this is not the case. LEDs emit the same, if not more light than a bulb, whilst consuming less power and so less strain is put on the battery.
Watts are a measure of power consumption, while lumens are a measurement of visible light output. When you want to know how bright a light will be, you need to identify the lumen output value and not the wattage.