GLOSSARY
AC (~) Alternating Current, as found in the mains power supply. ACCENT LIGHTING
AC AZIMUTH
The ‘swivel’ angle, as used in floodlighting or display lighting designs and installations.
Also commonly called display or highlighting. Accent lighting is typically at a higher intensity to emphasise an object or area. A Ratio of 3:1 versus ambient lighting is recommended for accent lighting to be noticeable.
BALLAST LUMEN FACTOR (BLF)
The proportion of light emitted by a luminaire when in emergency mode, usually powered by batteries, compared to the normal mains powered output. BLF figures can be <10% or 0.1 as emergency lighting levels are far lower than those required for normal lighting.
BAYONET CAP (BC)
A common lamp cap found on many lamps in domestic use in the UK. The lamp cap has two small pins that protrude from the base, these are inserted into the lamp holder and lock the lamp in place as it is rotated. B15 and B22 are the most common types.
AMBIENT LIGHTING
The general background illuminance is usually at a low level and with a task and/or accent lighting used for the task or display.
BEAM ANGLE AMBIENT
Not, as commonly thought, the width or angle of light emitted from the lamp/ luminaire. Instead, the point where intensity reaches 50% of the peak value.
B15d B22d
GU10 TASK 36º -45º -18º 90º AMBIENT TEMPERATURE (TA)
The air temperature surrounding the luminaire or component. LED luminaires are particularly temperature sensitive to excess temperature affecting performance and rated life. See also Junction Temperature.
AMPERE (AMP)
The unit for measuring rate of flow of electrical current: Current (Amps) = Power (Watts) / Voltage (Volts)
ASYMMETRIC LIGHT DISTRIBUTION
Where the distribution of light from a luminaire is not even in one plane. Common in display luminaires such as ‘wall washers’ where light is directed intentionally in one direction.
TA ºC BINNING
The method used for sorting LED chips during manufacture, typically based on output and colour temperature. The latest manufacturing techniques employed by leading chip manufacturers are yielding chips that no longer require binning as the consistency and tolerance are greatly improved.
BRIGHTNESS
Whilst brightness is what people see and react to, luminance is the actual surface brightness of an object and is measured in candelas per metre2
. BATHROOM ZONES
Bathroom lighting needs to be functional and safe. It is divided into zones where only suitable light fittings should be used.
• Zone 0 is inside the bath or shower. Any fitting used in this zone must be low voltage, (max 12v) and rated at least IP67 which is immersion proof.
ASYMMETRIC BEAM
DISTRIBUTION
• Zone 1 is the area above the bath to a height of 2.25m from the floor. In this zone, a minimum rating of IP65 is required.
• Zone 2 is the area stretching 0.6m outside the perimeter of the bath and the area between zone 1 and the ceiling up to 3m. Also the area around the wash basin, within a 60cm radius of any tap. In this zone, a minimum rating of IP44 is required.
304 Specification Guide +18º +45º Beam Angle 60º
GLOSSARY
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