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The energy performance of a lighting system is influenced by a number of factors. These typically include the illumination level required for the type of space being lit (e.g. classroom vs. gymnasium), the lamp and fixture type selected (e.g. incandescent vs. compact fluorescent), the luminous efficacy and electricity load for each lamp, the total number of fixtures installed, and finally, the operating hours of the lamps. Refer to the Lighting Losses Diagram and the Lighting Schematic for more information.

Software & Data
The RETScreen Software Lighting Model can be used worldwide to evaluate the energy use and savings, costs, emission reductions, financial viability and risk for lighting energy efficiency measures. The software can model a wide variety of projects ranging from installation of high efficiency lamps and luminaries in houses, commercial and institutional buildings and industrial facilities, to installation of timers, twilight switches and occupancy sensors in commercial and institutional buildings, to lamp height reduction combined with de-lamping in industrial facilities. The software contains a database of lamp and fixture efficiency for lighting systems such as incandescent; halogen; fluorescent; high and low pressure sodium; mercury vapour; metal halide and light emitting diode (LED) lamps. The model also calculates the cross-effects of other energy efficiency measures employed in the facility (e.g. heating and cooling impact of installing efficient lighting systems). The software (available in multiple languages) also includes product, project and climate databases, and a detailed user manual.

Click here to download RETScreen Suite

Training material
Lighting - UNEP - Presentation slides (572 KB)
Lighting - UNEP - Speaker's notes (29 KB)
Lighting - UNEP - Quiz (20 KB)

e-Textbook / Guides
Lighting - UNEP - Guide (445 KB)
Lighting Reference Guide (1.91 MB)
Fluorescent Lamp and Ballast Options - Technical fact sheet (269 KB)
Lighting Control - Technical fact sheet (208 KB)
Lighting Options for Gymnasiums - Technical fact sheet (269 KB)

Case studies / Templates
Energy efficiency measures - Commercial - Lights - Compact fluorescent light
Energy efficiency - Commercial - Lights - Fluorescent T8 - electronic ballast
Energy efficiency - Commercial - Lights - Water heater - Office / South Africa
Energy efficiency - Commercial - MNECB
Energy efficiency measures - Industrial - Manufacturing - Plastic
Energy efficiency measures - Institutional - Lights - School / Canada
Energy efficiency - Other - Agr. - Lights - Fluorescent T8 - elec. ballast / Canada
Energy efficiency measures - Residential - House - Energy efficient
Energy efficiency - Residential - MNECB


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