Related Clues:
- Light-flow measure
- Projector unit
- Unit of brightness
- Quantum of visible light
- Unit for measuring flow of light
- Light-intensity measure
- Quantum of light
- Light particle
- Unit of light-bulb intensity
- Unit for light bulbs
- Light unit in physics
- 'Particle' of light
- Quantum particle of light
- Measure of brightness
- Photometry unit