The ratio of light output (lumens) to input power (watts), expressed in lumens per watt. Used in measuring the amount of light given off by a light source. The higher the lumen efficacy, the more efficient the source is at producing light.
A metric used to compare light output to energy consumption. Efficacy is measured in lumens per watt. Efficacy is similar to efficiency, but is expressed in dissimilar units. For example, if a 100-watt source produces 9000 lumens, then the efficacy is 90 lumens per watt.
The amount of energy service or useful energy delivered per unit of energy input. Often used in reference to lighting systems, where the visible light output of a luminary is relative to power input; expressed in lumens per Watt; the higher the efficacy value, the higher the energy efficiency.
The rate at which a lamp is able to convert power (watts) into light (lumens). A watt of electricity is the amount of power in and a lumen or light is the amount of power out. Represented in lumens per watt and found by dividing the light output in lumens by the electrical power input (to the lamp). Also see LPW performance.
Efficacy is an industry term for the amount of light produced per watt of electricity (comparable to efficiency). It is the rate at which a light bulb is able to convert electrical power (watts) into light (lumens), expressed in terms of lumens per watt (LPW). For example, a 100 watt lamp producing 1750 lumens gives 17.5 lumens per watt.
Efficacy is the rate at which a lamp is able to convert electrical power (Watts) into light (Lumens), expressed in terms of lumens per watt (LPW). Put simply, a watt or electricity is the amount of power in and a lumen or light is the amount of power out. Efficacy is a critical consideration when evaluating a lamp because lighting represents 30 to 50% of the total operating cost of a typical installation and can affect related costs such as air conditioning. Secondly, energy accounts for 86% of the cost of an average lighting investment (maintenance accounts for 11%; the lighting itself, 3%) and has a major impact on operating costs. And finally, a lighting system that uses energy efficiently is beneficial to the environment.
A measure of the luminous efficiency of a radiant flux, expressed in lumens per watt as the quotient of the total luminous flux by the total radiant flux. For daylighting, this is the quotient of visible flux incident on a surface to radiant flux on that surface. For electric sources, this is the quotient of the total luminous flux emitted by the total lamp power input.
Efficacy is a user-friendly education system packaged as both a "free" product for those with limited or no income and a retail product. Efficacy, increases a persons ability, opportunity, and income. Efficacy, is a university in a box.
Efficacy studies, usually randomised controlled trials, are undertaken under experimental or'controlled' conditions to develop and refine strategies. They provide important, but limited, information regarding the outcomes of interventions under ideal circumstances.
A term borrowed from pharmacology describing the maximum response of anadministered supplement, regardless of the dose. At a certain point, consuming more of a particularsubstance fails to elicit any greater effect. For example, the chemically dissimilar supplements Aand B have each been shown to increase lean body mass by different mechanisms. However, product Aalways results in greater total increases in lean body mass than supplement B. So, no matter how muchsupplement B a person consumes, he/she cannot expect greater increases in lean body mass with B whencompared with an optimal dose of A. Similarly, for a person in excruciating pain, no quantity of aspirinwill be as efficacious as an optimal dose of morphine. Efficacy is much more important than eitherbioavailability or potency.
In vaccine research, the ability of a vaccine to protect vaccinated people against a specific infection or disease. A vaccine may be tested for efficacy in Phase III trials if (smaller) Phase I and Phase II trials show it to be safe and promising.
a measure of the benefit resulting from an intervention for a given health problem under the ideal conditions of an investigation; it answers the question, "Does the practice do more good than harm to people who fully comply with the recommendations?" ( Therapy)
the benefit of using a technology for a particular problem under ideal conditions, for example, in a laboratory setting, within the protocol of a carefully managed randomized controlled trial, or at a "center of excellence."
The ability of a treatment to achieve the desired results under ideal study conditions. Most clinical drug trials are performed under these conditions, in which ideal patients are selected to test a product's ability to treat infection, for instance. The potential effects of treatment resulting from the drug under optimal circumstances. (e.g. patients all taking their doses at the right times, physicians prescribing correct doses, side effects appropriately monitored, etc). Efficacy studies are typically the foundation of new drug submissions to the Food and Drug Administration (FDA). Studies that compare the efficacy of similar drugs, rather than just efficacy compared to placebo are preferable.
Political self-confidence; a citizen's belief that his or her politial participation can produce a desired outcome. | Darlene attributed her volunteer campaign work to her interest in the issue and her efficacy. [ Lesson 10
The term used to indicate that a drug works. When new drugs are created in the United States, before they can be used by patients, clinical efficacy trials must be conducted to prove the drug produces a significant improvement compared with placebo (sugar pill). Close Window
(Of a drug or treatment). The maximum ability of a drug or treatment to produce a result regardless of dosage. A drug passes efficacy trials if it is effective at the dose tested and against the illness for which it is prescribed. In the procedure mandated by the FDA, Phase II clinical trials gauge efficacy, and Phase III trials confirm.
Measure of effectiveness to determine the rates of pregnancy prevention. For the purposes of the TodayÂ® Sponge, efficacy is measured as method effectiveness and use effectiveness.â€¢ Method Effectiveness Â— The level of effectiveness expected by women who follow the printed instructions exactly, using the TodayÂ® Sponge every time they have intercourse. As users become more familiar with the product, method effectiveness rates increase. â€¢ Use Effectiveness Â— The level of effectiveness that can be expected by a large group of women, some of who either fail to use TodayÂ® Sponge correctly or do not use it every time they have intercourse.
If researchers show that a drug has 'efficacy' (or is 'efficacious'), they show that it improves a disease or condition in a controlled environment, like a laboratory. Proving efficacy is a first step to show that the drug can work when it is taken in the right way. If researchers show that a drug is 'effective', they show that it improves a disease or condition outside of a controlled environment. For instance, if a drug lowers cholesterol in a study, it is efficacious. But if that drug has to be taken exactly 1 hour after eating, it might not be effective because it is too hard for people to remember to take it at exactly the right time.
the measure of a vaccines (or treatment's) effectiveness. Measured by the proportion of those immunised who don't get a disease when exposed to it, or by the number of antibodies produced by the immune system.
In vaccine research, the ability of a vaccine to produce a desired clinical effect, such as protection against a specific infection or disease in a given population. A vaccine may be tested for efficacy in Phase 3 trials if it shows some promise in smaller Phase 1 and 2 trials.
Demonstration That the vaccine induces a defined biological outcome (e.g. - reduced clinical disease, reduced shedding of a pathogen, reduced transmission of a disease agent) that is relevant to the label claim on the vaccine.
The BMW I have selected for a test drive blows all four tires, stalls out and crashes on the dealer’s special runway. I spend two days in the hospital. This is a breakdown in efficacy. See effectiveness.
How well something functions, such as a drug treatment. Antiretroviral (anti-HIV) drugs are effective if they decrease the amount of HIV in the blood (viral load). Antiretroviral drugs are also effective if they increase CD4 T-cell counts.
The degree of the benefit of treatment when compared to the risk. It is based on subjective and objective evaluations of both the relief of pain and return to function, and the time and effort to achieve them.