Energy consumption is a key decision factor for any lighting solution. Knowing that lighting represents up to 30% of a building's energy consumption, it is clear that remarkable savings in operational cost can be achieved with a good lighting design.

Energy savings can be achieved in different ways:

Converting standard lamps and/or conventional gear for energy friendly lamps and/or HF ballasts in existing lighting installations
Complete and integral (renovation) project.

It is clear that re-doing the lighting installation normally generates the highest energy savings but many times even a re-lamping exercise can lead to significant cost reductions.

Below all criteria for Lighting System components are listed

Lamps

Selection criteria
To achieve maximum savings one should select the range of lamps that meet the quality requirements such as colour properties, light intensity, etc and then choose the lamp which has the highest efficacy within the group. Selection criteria are:

Luminous efficacy of lamps (lm/W ratio ? the higher the better)
Luminous flux and lumen depreciation over time
Damage factor
Colour parameters (colour rendering, colour temperature, colour shifting)
Average lamp life