A piece of conductive metal, often tungsten, used to conduct electrons or in other words permit electricity to flow through a gas fill. Electrodes are used in all discharge bulbs other than induction bulbs. They are classified as cathodes and anodes.
A bulb technology that operates without electrodes. The most common present day version of this technology is known as an induction bulb.
Induction bulbs use radio waves for the excitation of its internal gases and mercury. They have a significantly increased lifespan over HID bulbs for example of 100,000 hours or more. This lifespan is simply theoretical and actually could be much longer. However, while a bulb may have a very long lifespan, any bulb that relies on intermediary circuit components may have a factor other than the bulb itself that causes the bulb to become inoperative. This technology is able to generate high lumen outputs and is considered to be an HID substitute of sorts. Its luminous efficacy is not significantly superior if at all to that of metal halide bulbs.
A simple type of low frequency ballast that operates using a core and coil design to start both fluorescent bulbs and high intensity discharge bulbs.
Program developed in 1992 as a joint effort between the Environmental Protection Agency (EPA) and the Department of Energy (DOE). Served to indirectly establish additional regulation of product standards by offering voluntary participation to interested manufacturers.
The Energy Star program sees the consumer market as its largest consumer of covered products and thus tends to be of greater importance to that market as opposed to the commercial market.
Energy Star does no internal testing and thus contracts all testing out to private laboratories.
A name for the outer shell or "container" of a light bulb. Most commonly it is glass but can be made of other materials. The term envelope is generally used when speaking of a solid simple shaped outer shell of a bulb such as a cylindrical, spherical, egg shape or the like. So, for example it would not be accurate to refer to the outer glass of a helix shaped bulb as an envelope.
Mark issued by Intertek Laboratories to certify the compliance of a tested item with an applicable standard such one written by Underwriter's Laboratories or American National Standards Institute. This listing is essentially the same as an Underwriter's Laboratories certification.
Excessive Neutral Current
"Current overload created in the neutral wire of 4-wire, three phase Wye systems by load unbalance or 'third harmonic'." - Advance Ballast Glossary