text: Spectroradiometers, which operate almost like the visible region spectrophotometers, are designed to measure the spectral density of illuminants. Applications may include evaluation and categorization of lighting for sales by the manufacturer, or for the customers to confirm the lamp they decided to purchase is within their specifications. Components:
  # The light source shines onto or through the sample.
  # The sample transmits or reflects light.
  # The detector detects how much light was reflected from or transmitted through the sample.
  # The detector then converts how much light the sample transmitted or reflected into a number.