: Used in fluorescent and HID lighting to provide starting voltage and regulate current.
: Provides light in all directions, typically from ceiling-mounted fixtures with diffusers. Measurement and Units : Mathematics (26303)
: Defined by the NEC (National Electrical Code). Class I involves flammable gases, Class II involves combustible dust, and Class III involves ignitable fibers. : Used in fluorescent and HID lighting to
: The intensity of a light source in a specific direction. Fixture Components : Class II involves combustible dust
: The basic measure of the total amount of light produced by a source.
: The unit for measuring illuminance (light falling on a surface). One lumen falling on one square foot equals one footcandle.