Ljus, tid och rum - Ljuskvalitet, spektralfördelning och ekoeffektivitet för plasmalampa, i jämförelse med högtrycksnatrium- och induktionslampa

The choice of light source is important for eco-efficient lighting. To assess the echoeffectiveness, it is essential to clarify how much and what kind of light you need, for each specific situation. To analyze this it is crucial to understand the need for different wavelengths. The Plasma lamp has a continuous spectrum and gives a relatively high proportion of photons with high energy. In many critical situations, such as to discover a moose on the roadside in the darkness, it is essential that the spectrum contains a large enough share light with short wavelengths. The ability to see well at low brightness is also an important environmental issue. It is important that we feel that we can see, so that we can feel safe in the park without having to have loads of energy-consuming lighting everywhere, at all times. To compare the utility value of the lamps light under such circumstances, I have decided to convert my measured lumen values by using the eye's sensitivity curve for scotopic vision, ie. night vision. From this perspective the plasma lamp provides 72 lm'/ W, while the induction lamp provides 45 lm' / W and the HPS lamp 34 lm'/ W. From a conventional light-measurement perspective, it looks as if the HPS lamp provides the largest lm/W-value. From environmental point of view, the plasma lamp's spectral distribution is very interesting because it allows for a minimum critical level of indulgence in an energy effective manner. In the current technological level of development, it is a serious limitation that the plasma technology only is economically feasible for large light sources. The report's way of thinking about the importance of different wavelengths can provide guidance for the selection of different types of LED-based light sources