What is Light Theory
As a light source, the sun is the primary source of infrared light. It emits visible light, infrared light and ultraviolet light. However, daylight can be unpredictable due to changing weather conditions and clouds tend to block most of the infrared spectrum. The best infrared photographs therefore ten HID (high intensity discharge) lamps produce light by surging electricity through pressurized gas. Normally, these lights are used in locations such as shopping malls, sports stadiums and street lighting. Like fluorescent light, HID is a discontinuous light source, meaning that it doesn’t burn (continuous light sources are the opposite – the sun, candles etc. all burn). In common with other discontinuous light sources, HID emits mainly visible light and quite a bit of far infrared light but just like fluorescent lights lacks useful output in the near IR range that is used for infrared photography to be captured in direct sunlight.