In the old days, the mainstream lighting instruments for work were halogen lights and mercury lamps. Nowadays, however, there is a wide variety of products with differing properties, such as Artificial Solar Lights, Metal Halides, and LEDs.
Lights are categorized by the type of lamp they have. Lamps have different properties, many of which are factors which affect the selection of products. The main factors are: color rendering, color temperature, and brightness. Depending on the light’s use, the importance of these factors will change, so it is difficult to make general statements, but they are all displayed on most product specifications and can be used as a guideline for selecting products.