ballast

(redirected from Lamp ballast)
Also found in: Dictionary, Thesaurus, Financial, Encyclopedia.

ballast

(bal'ăst),
1. Material of doubtful value itself used to stabilize something (for example, maritime practice). 2. Something largely without intrinsic value.

ballast 

Additional weight of material incorporated in a part of a contact lens to maintain it in a given orientation (Fig. B1). This is often provided by giving prismatic power to the lens (prism ballast lens).
Fig. B1 Truncated and prism-ballasted toric contact lensenlarge picture
Fig. B1 Truncated and prism-ballasted toric contact lens
References in periodicals archive ?
The 4-Kbyte Flash AT90PWM1 offers a cost-effective solution for low-end HID lamp ballasts and dimmable fluorescent lamp, requiring an analog control interface.
Housed in a wide body SOIC 16 pin package, this multichip device contains an application specific frequency control circuitry for fluorescent lamp ballasts and a high side driver compatible with any high voltage MOSFET or IGBT half bridge.
DOE Energy Conservation Standards for Fluorescent Lamp Ballasts sets forth a regulation that creates a new metric for measuring ballast efficiency and establishes a higher standard of efficiency that will impact many of today's fluorescent T8, T5 and T12 ballasts.
Technology advances and new standards for equipment such as air conditioners, refrigeration equipment, water heaters and fluorescent lamp ballasts may bring further savings to a retailer's bottom line, according to U.
New lighting technologies, such as solid-state Light Emitting Diode (LED) lighting technology, dimmable fluorescent ballasts and High Intensity Discharge (HID) lamp ballasts, demand increased performance with greater energy efficiency.
The IRS2166 is a 600V fully-integrated and protected control IC for advanced fluorescent lamp ballasts which incorporate power factor correction (PFC).
The heavy duty lamp ballasts are mounted to the base platform to provide added stability and operate with common 120-277 VAC electrical current.
International Rectifier, IR([R]) (NYSE:IRF), a world leader in power management technology, today introduced the IRS2168D fully-integrated and protected high-voltage integrated circuit (HVIC) for advanced electronic linear fluorescent lamp ballasts which incorporate active power factor correction (PFC).
As a result, when designing four lamp ballasts, a designer can control THD to be less than 10 percent even if only one lamp is turned on.
98 Ohms in the STD7N52K3 at 525V boosting operating efficiency in applications such as low-energy lamp ballasts.
International Rectifier, IR[R] (NYSE:IRF), a world leader in power management technology, today introduced a 600V fully-integrated and protected ballast control IC for advanced linear fluorescent lamp ballasts which incorporate active power factor correction (PFC).