Different Types of Light Sources   Natural  Artificial 1. Sunlight, skylight 1. Incandescent sources Blackbody sources Nernst glower and globar Tungsten filament 2. Discharge lamps Monochromatic and spectral sources High-intensity sources Carbon arc Compact short arc Flash Concentrated zirconium arc Fluorescent lamps 3. Semiconductor light emitting diodes (LED) 4. Coherent source - laser