This document discusses hazards from non-ionizing radiation and principles of control. It defines non-ionizing radiation as photons with energy less than 12.4 eV and describes its regions including ultraviolet, visible, infrared, and radiofrequency. The main hazards are tissue heating from absorption of energy and photochemical interactions from UV. Effects include eye damage, skin burns, cancer, and damage to internal organs. Control methods include shielding, containment, distance, reducing exposure time, and personal protective equipment.