BREEAM – BRE Environmental Assessment Method – See LEED Below.
CRI – Colour Rendering Index measures the ability to distinguish different colours. Measured in Ra from 0 – 100. The higher the Ra, the easier it is to see the difference.
COB – Chip On Board – A type of LED module that appears as a single yellow phosphor circle on a white board. Because of this, they are sometimes nicknamed “fried eggs”.
Driver – An electrical Devise which regulates the power to an LED.
Emergency ‘Maintained’ – the same LED is used for normal light output and for Emergency light output. When in emergency mode, the light output will be significantly lower – eg 8% of normal levels.
Emergency ‘Non-Maintained’ – a separate dedicated LED is used for Emergency mode.
Encapsulated – Sinking the Driver (or other Electrical Part) in a Sand & Resin compound to dissipate heat, extend component life and minimise noise emissions. A disadvantage is that the Driver cannot be removed from its Enclosure once it has been encapsulated.
EPA – Effective Projected Area – of a Luminaire is used to calculate suitable Pole strengths in various wind conditions.
IES – Illuminating Engineering Society of North America.
IP Rating – Ingress Protection rating. A measurement of how well sealed a Luminaire is. The first digit after IP refers to dust protection, the second digit refers to water protection. Full details given separately – see Menu for Tech Info.
K – Degrees Kelvin. See Colour Temperature.
L70 / L80 / L90 etc: Measurement of Life of LEDs or LED Modules in a Luminaire. Given in hours, it indicates how many hours expected operation before the light output drops to 70%/80%/90% etc of initial light levels. See LED Basics.
LED – Light Emitting Diode – is a semi-conductor light source.
LEED / BREEAM –
LEED stands for Leadership in Energy and Environmental Design, and is run by the USGBC. It is commonly specified by US multinationals and like BREEAM, has a broad international appeal. There are a number of LEED certified buildings in Ireland. There is a great deal of similarity between the two assessment methods and they broadly cover most of the same criteria. However, LEED has a tendency to refer to US standards whereas BREEAM refers to European standards and can be tailored to use the building standards and best practice guides of the host country to demonstrate compliance.
For example, in the energy section of BREEAM, you demonstrate compliance by producing a BER or NEAP calculation for the building, which in Ireland you would have to do to comply with building regulations. Up until recently LEED asked projects to do energy modelling based on ASHRAE standards to demonstrate compliance. However, LEED now allows BREEAM equivalency to award energy credits meaning the BER approach can be recognised. Both methodologies are trying to adapt more to international markets and are constantly evolving, sometimes even borrowing ideas from each other to make improvements. (See Article from Engineers Ireland on BREEAM ).
Lumen – Measurement of the Output of light from a Lamp.
Luminaire – Apparatus or fitting that holds an LED/LED module/Lamp.
Lux – Measurement of the light received at a point (1 Lux = 1 Lumen per square meter).
MH – Mounting Height.
Photocell – A device which switches off the Luminaire during day time. A 35/18 Photocell will switch on the light at 35 Lux and off again at 18 Lux.
Ra – See CRI above.
Transformer – Electrical component used to change 230v electrical supply to other voltages (usually 12v) which some luminaires require to operate.