Why do some lights light brighter than others? (I’m in Junior Infants)

Question: Why do some lights light brighter than others? (I'm in Junior Infants)
- Keywords:
  brightness,
  light,
  physics
Asked by Erin to Victoria on 18 Nov 2014.
- Victoria Simms answered on 18 Nov 2014:
  
  Perhaps because some lights have larger sources of energy, this makes them brighter.

Question: Why do some lights light brighter than others? (I'm in Junior Infants)