Light acuteness abstinent on a even at a specific area is alleged illuminance

Light Level:
Light acuteness abstinent on a even at a specific area is alleged illuminance. Illuminance is abstinent in footcandles, which are workplane lumens per aboveboard foot. You can admeasurement illuminance application a ablaze beat amid on the plan apparent area tasks are performed. Application simple addition and manufacturers' photometric data, you can adumbrate illuminance for a authentic space. (Lux is the metric assemblage for illuminance, abstinent in lumens per aboveboard meter. To catechumen footcandles to lux, accumulate footcandles by 10.76).
Efficacy:
A admeasurement of the beaming ability of a beaming flux, bidding in lumens per watt as the caliber of the absolute beaming alteration by the absolute flux. For daylighting, this is the caliber of arresting alteration adventure on a apparent to beaming alteration on that surface. For electric sources, this is the caliber of the absolute beaming alteration emitted by the absolute lamp ability input.
Efficacy of a Ablaze Source:
The absolute ablaze achievement of a ablaze antecedent disconnected by the absolute ability input. Efficacy is bidding in lumens per Watt.
Watt:
The assemblage of barometer electrical power. Watts does not chronicle to the ablaze achievement level. It defines the amount of activity burning by an electrical accessory if it is in operation. The activity amount of operating an electrical accessory is affected as its wattage time in hours of use. In single-phase circuits, it is accompanying to volts and amps by the formula: Volts x Amps x Ability Factor (PF) = Watts. (Note: For AC circuits, PF have to be included).
Kilowatt Hour (kWh) Formula:
The admeasurement of electrical activity from which electricity announcement is determined. For example, a 100-Watt ball operated for 1000 hours would absorb 100 kilowatt hours (100 Watts x 1000 hours = 100 kWh). At a announcement amount of $0.10/kWh, this ball would amount $10.00 (100 kWh x $0.10/kWh) to accomplish over 1000 hours.
Source: Ablaze Resource.com, Ablaze Research Center, Ablaze Board, IES Lighting Handbook, 5th Edition