ballast

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ballast

(bal'ăst),

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

Farlex Partner Medical Dictionary © Farlex 2012

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 lens

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[ClickPress, Thu Feb 28 2019] Market Research Reports Search Engine (MRRSE) has recently updated its massive report catalogue by adding a fresh study titled " Energy Efficient Lamps and Ballasts Market Valuable Growth Prospects and Insights on Future Scenario -- By MRRSE ".

Energy Efficient Lamps and Ballasts Market Valuable Growth Prospects and Insights on Future Scenario

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.

DOE Federal Ballast Ruling Effective November 14. Are You Ready?

Because people can be exposed to PCBs by breathing contaminated air or by touching materials, leaking ballasts must be removed and properly disposed of along with any part of the fixture that has come in contact with PCBs.

Dated light fixtures may pose toxic risk: your old fluorescent ballasts could be leaking a potentially harmful chemical

-State Systems selects Green Ballast's daylight harvesting fluorescent light ballasts

The investigation also revealed another significant problem--the casing around many of the toxic ballasts had broken, allowing PCBs to spread to the fixture housing, wires and diffusers.

More toxic ballasts in New York schools

One of the issues around the application of CDM lamps on QMH ballasts has to due with the difference in lamp power factor (PF) between these two types.

Evaluation of system energy savings of ceramic metal halide lamps suitable for probe-start and pulse-start systems

Environmental Warning: Old ballasts may contain polychlorinated biphenyls (PCBs), a toxic substance that must be disposed of properly.

Upgrade fluorescent fixtures and save energy

As fewer UV lamps are required, the number of electronic ballasts is fewer and there is always one for each lamp.

In-pipe UV disinfection of wastewater

International Rectifier, IR, (NYSE:IRF), El Secundo, Calif., has introduced a single-chip fluorescent lamp ballast device with an active, critical conduction mode, boost-type power factor correction (PFC) method.

IR DEBUTS SINGLE-CHIP FLUORESCENT LAMP BALLAST DEVICE

* Lighting specialists Ronfell Group, has launched a revolutionary range of 'Multi-Watt High Frequency Fluorescent and Metal Halide Ballast' for the lighting industry.

Ronfell Group,

Against this background, the paper discusses the engineering and economic characteristics of standard and energy-efficient magnetic ballasts for fluorescent lighting.

Energy-efficient lighting: market data, market imperfections, and policy success