GLOSSARY OF TERMS
INGRESS PROTECTION (IP) RATING A system that identifies the protection that a lamp or luminaire has against solid objects and water. The first digit being solid object protection and the second one resistance to water. All Luceco products IP20 unless otherwise stated.
PROTECTION AGAINST SOLID FOREIGN OBJECTS
IP 0
1 2 3 4 5 6 TESTS No protection
Full penetration of 50mm diameter of sphere not allowed. Contact with hazardous parts not permitted.
Full penetration of 12.5mm diameter of sphere not allowed. The jointed test finger shall have adequate clearance from hazardous parts.
The access probe of 2.5mm diameter shall not penetrate.
The access probe of 1mm diameter shall not penetrate.
Limited ingress of dust permitted (no harmful deposit).
No ingress of dust.
IP65 RATED
ISOLUX DIAGRAM A graphical representation of common illuminance levels to show lighting levels over a calculated area.
6.0 [m]
PROTECTION AGAINST HARMFUL INGRESS OF WATER
IP 0
1 2 3 4 5 6 7 8 IES
Illuminating Engineering Society, an American organisation that provides standards and recommendations. Photometric data files are common in .ies file format.
ILLUMINANCE The intensity of light falling on a surface area. If the area is measured in square feet, the unit of illuminance is footcandles (fc). If measured in square meters, the unit of illuminance is lux (lx).
INDIRECT LIGHTING Lighting that is reflected by room surfaces or within the luminaire before falling on to the working area. As a result of reflection it is often lower in intensity and glare.
INITIAL LUMENS The output up to 100 hours use.
INRUSH CURRENT Components such as drivers can have high inrush currents for milliseconds due to the use of capacitors, this should be considered when specifying switching and breaker ratings.
INTEGRATING SPHERE A device used for a variety of optical, photometric, or radiometric measurements.
TEST No protection
Protected against vertically falling drops of water.
Protected against vertically falling drops of water with enclosure tilted 15˚ from the vertical.
Illuminance [lx]
Protected against sprays to 60˚from the vertical.
Protected against water splashed from all directions - limited ingress permitted.
Protected against low pressure jets of water from all directions - limited ingress permitted.
Protected against strong jets of water e.g. for use on ship
decks - limited ingress permitted. Protected against the effects of
immersion between 150mm and 1m.
Protected against continuous submersion at a specified depth.
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
0.0 200 1.0 300 2.0 3.0 500 4.0 5.0 6.0 [m] 750 1000 N
JUNCTION
The point at which the Positive and Negative conductors meet in a LED.
JUNCTION TEMPERATURE A critical consideration in LED lamp or luminaire design. For every 10˚C that the junction temperature exceeds the optimum figure, life of the LED chip is reduced by 50%. Overrunning LEDs by operating at higher amps will cause this to happen.
KELVIN
The SI unit used to measure and denote colour temperature, degrees Kelvin.
kWh Kilo-Watt-hour is the typical billing unit for electricity costs and represents 1kW of power over a 1 hour duration.
LAMP A lamp converts electrical power into light and sometimes they are called ‘bulbs’ due to the traditional lamp shape.
LED
Light Emitting Diode. An LED is a solid-state semiconductor device that converts electrical energy directly into light. On its most basic level, the semiconductor is comprised of two regions. The p-region contains positive electrical charges while the n-region contains negative electrical charges. When voltage is applied and current begins to flow, the electrons move across the n-region into the p-region. The process of an electron moving through the p-n junction releases energy. The dispersion of this energy produces photons with visible wavelengths. Most LEDs emit a blue light as that is the most efficient format, a phosphor coating turns the blue light into the white light required.
LED RATED LIFE LED chip figures are quoted by the chip manufacturer and in some cases these are not translated when the chip is used in a luminaire where it can run hotter. As heat affects the LED chip, the life can be reduced dramatically.
156 LIGHTING POSSIBILITIES
30,000 HOURS
TECHNICAL
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