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DALI (Digitally Addressable Lighting Interface)
An industry standard system protocol that allows components from different manufacturers (ballasts, controls systems, sensors, controllers, switches, etc) to be mixed together seamlessly into complete systems.
DC forward current
Continuous direct current applied which is constant over time.
Design Lumens
The amount of light that the lamp produces after it has operated for approximately 40 percent of its rated life.
Die
Chip: heart of the LED.
Diffuser
A device to redirect of scatter the light from a source by the process of diffuse transmission.
Diode
A two-electrode device with an anode and a cathode that passes current in only one direction. It may be designed as an electron tube or as a semiconductor device.
Direct Current (DC)
An electrical current flowing steadily in one direction only.
Direct Glare
Glare resulting from high luminance or insufficiently shielded light sources in the field of view, or from reflecting areas of high luminance. It is usually associated with bright areas such as luminaires, ceilings and windows that are outside the visual task or region being viewed.
Direct Lighting
Lighting by luminaires distributing 90 to 100 percent of the emitted light in the general direction of the surface to be illuminated. The term usually refers to light emitted in a downward direction. (See accent lighting.)
Directional Lighting
Illumination on the work-plane or on an object predominantly from a single direction.
Discharge Lamp
A light producing device that depends on an electric arc, rather than a filament, to create illumination.
Driver
Electronics used to power illumination sources. Ballast.
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