News from Germany: LED street lighting comparison SQM and SQM-L

Transcription

1 News from Germany: LED street lighting comparison SQM and SQM-L Wien, 23rd August 2008 Fachgruppe DARK SKY der Vereinigung der Sternfreunde Andreas Hänel Planetarium, Museum am Schölerberg, Osnabrück

2 LED lighting rapid increase of efficiency of white light LEDs long lifetime compactness dimmable/switchable sturdy low light pollution? still lower efficiency (NAV) expensive thermal management colour rendition TRIDONIC.ATCO

3 no light pollution LEDs are highly directional Osram

4 no light pollution LEDs are highly directional no reflectors needed -> end of luminairies? LED

5 spectral sensitivity white light -> good colour rendition mixture of red - green - blue Cree

6 spectral sensitivity white light GaN + converter Osram warm cold Cree

7 spectral sensitivity comparison with human eye and circadian curve (Gall): ahae maximum at circadian curve minimum at scotopic curve Cree

8 Soest 3rd in Nordrhein-Westfalen pyramidal, structural glass extremely glaring -> very high light pollution!

9 Soest LED LED HQL CFL NAV CFL very high blue emission

10 Düsseldorf Fleher Deich 25 x Seoul P lm 125 FWHB 77 lm/w white 6500 K ~8

11 Düsseldorf Fleher Deich very high uniformity (13-15 lux) but trees! no light in gardens uncomfortable (blue) light glaring

12 Düsseldorf Fleher Deich high blue contribution test with warm LEDs planned project Prof. Eisenbeis, Stadtwerke Düsseldorf et al. to study attractivity of different light sources on insects

13 spectral sensitivity Innolumis (Lemnis/Imtech) solution? mixture of red (630 nm) - green (500nm) Lemnis

14 Measuring sky brightness with the SQM handy tool quick measurements but know and respect the limits! test by Pierantonio Cinzano

15 SQM gives no V mag, gives no cd/m²! B S V P NAV is brighter SQM

16 corrections would be necessary

17 Angular response SQM and SQM-L (FWHM) Cinzano

18 Angular response SQM and SQM-L Mohar

19 Angular response SQM and SQM-L (5m = 1%) Cinzano

20 Angular response SQM and SQM-L Brunet

21 Angular response SQM and SQM-L SQM SQM measures 0.3 mag/arcsec² brighter than a point source SQM-L SQM-L measures 0.1 mag/arcsec² brighter Difference SQM and SQM-L 0.2 mag/arcsec²: measured 0.3

22 Continous measurements since 2/ SQM SQM-L D-05 F-06 A-06 J-06 A-06 O-06 D-06 F-07 A-07 J-07 A-07 O-07 D-07 F-08 A-08 J

23 Parc naturel Camargue

24 Parc naturel Camargue Town inhabitants. distance zenith brightness mcd/m² Stes. Maries Aigues Mortes Arles Nimes Port St. Louis Montpellier Marseille/Aix sum mag natural sky total estimating the contribution from different cities using the Walker-law

25 Parc naturel Camargue distance [km] Le Grau du Roi 6000 inh. Aigues-Mortes 6000 inh. Saintes Maries 2500 inh. Port Camargue Stes. Maries sky background [mag/arcsec²]

26 example Austrian Alps Villach Alpine Road

27 example Austrian Alps Villach Alpine Road, to Dobratsch, Carinthia

28 example Austrian Alps Villach Alpine Road Villacher Alpenstr. Entfernung [m] up down Helligkeit [mag/arcsec²]

29 TERRA.vita, Osnabrück mag/arcsec²

30 TERRA.vita, Osnabrück observing place Münster amateurs

31 Sky background from the city (Walker law) 18.9 Walker-Gesetz Entfernung von OS [km] magnitude [mag/arcsec²] Kattenvenne Oldendorfer hin Oldendorfer rück Kattenvenne SQM

32 Many measurements in Germany 4 SQMs bought by Vereinigung der Sternfreunde SQM-L in polluted regions better than SQM

33

34 21.14 comparison with DMSP (not calibrated, higher spatial resolution) Osnabrück Melle Bielefeld

35 Sky background from the city (Walker law) reduction during the night 19.0 Distance from Osnabrück [km] <21: >22:00 Linear ( <21:30) Linear ( >22:00) sky background [m/arcsec²]

36 Comparison of nature parks Hongarie Kaposvar inh. variation with distance variation with population Hungary is darker! sky background [m/arcsec²] Distance from Osnabrück [km] Osnabrück inh. Melle inh <21: >22: Linear ( <21:30) Linear ( >22:00) sky background [mag/arcsec²] distance [km] Le Grau du Roi 6000 inh. Port Camargue 18.5 Aigues-Mortes 6000 inh. Stes. Maries 19.0 Saintes Maries 2500 inh

37 réduction pendant la nuit: dans notre jardin Sky Quality Meter: reduction de la brillance du fond de ciel pendant la nuit réduction d'illumination 21h -> 24h: 0,5 m /arcsec² 21:00: 19.6 m /arcsec² :12 20:24 21:36 22:48 0:00 1: :00: 20.1 m /arcsec²

38 spectral sensitivity Innolumis (Lemnis/Imtech) solution mixture of red (630 nm) - green (500nm) Lemnis