2009 Rensselaer Polytechnic Institute. All rights reserved. 2. Regional Workshop on Energy Efficient Lighting (RCEEL)

Size: px

Start display at page:

Stephen James
5 years ago
Views:

1 UNDERSTANDING LIGHTING Russell Leslie, FIES AIA LC Professor and Associate Director, Lighting g Research Center Rensselaer Polytechnic Institute April 29, 2009

Energy Lighting accounts for about 22% of the total

5 Energy Lighting accounts for about 22% of the total energy use in the U.S. Demand for energy keeps increasing i Industrial 14% Residential 27% Outdoor Stationaryti 8% Commercial 51% Lighting 22% Other 78% Source: U.S. DOE 2009 Rensselaer Polytechnic Institute. All rights reserved. 5 Regional Workshop on Energy Efficient Lighting (RCEEL)

Economics Environmental concerns Photo: Courtesy of FineLite 2009 Rensselaer

6 Effective, Energy-Efficient Efficient Lighting Considers: The needs of people using the space Visibility, visual comfort, and safety Architectural characteristics Economics Environmental concerns Photo: Courtesy of FineLite 2009 Rensselaer Polytechnic Institute. All rights reserved. 6 Regional Workshop on Energy Efficient Lighting (RCEEL)

7 In addition, businesses want Reasonable return on investment Easy to install, operate and maintain Substantiated proof of product claims Fully developed & tested products Successful demonstration of the technology elsewhere 2009 Rensselaer Polytechnic Institute. All rights reserved. 7 Regional Workshop on Energy Efficient Lighting (RCEEL)

8 8

9 9

10 10

11 11

12 12

13 Illuminance Lumens (lm) per unit area Unit: Lux (lx) lumens/meter² Footcandle (fc) lumens/foot² 2009 Rensselaer Polytechnic Institute. All rights reserved. 13 Regional Workshop on Energy Efficient Lighting (RCEEL)

14 14

16 16

17 17

18 Reflected glare on the computer screen from ceiling

18 Glare Direct glare from windows and luminaires 2009 Rensselaer Polytechnic Institute. All rights reserved. 18 Reflected glare on the computer screen from ceiling luminaires Regional Workshop on Energy Efficient Lighting (RCEEL)

19 19

20 Light Distribution Direct: % downward Semi-indirect: indirect: 10-40% downward; 60-90% upward 2009 Rensselaer Polytechnic Institute. All rights reserved. 20 Regional Workshop on Energy Efficient Lighting (RCEEL)

21 Light Distribution Indirect lighting: % upward General diffuse: 40-60% downward; 40-60% upward 2009 Rensselaer Polytechnic Institute. All rights reserved. 21 Regional Workshop on Energy Efficient Lighting (RCEEL)

22 22

23 23

24 24

25 25

26 26

27 27

28 28

29 29

30 30

31 Luminance Light reflected from a surface in a given direction (back towards the eyes) When we see an object, we see luminance Unit: Candelas (cd) meter² 2009 Rensselaer Polytechnic Institute. All rights reserved. 31 Regional Workshop on Energy Efficient Lighting (RCEEL)

33 Reflectance Percentage of light reflected back from a surface, the difference having been absorbed or transmitted by the surface 2009 Rensselaer Polytechnic Institute. All rights reserved. 33 Regional Workshop on Energy Efficient Lighting (RCEEL)

35 35

36 36

37 37

38 38

Correlated Color Temperature CCT Color appearance of a lamp

warmth or coolness of its appearance Below 3200 K - warm

- cool l(bl (bluish-white) hit 2009 Rensselaer Polytechnic

39 Correlated Color Temperature CCT Color appearance of a lamp measured in Kelvin (K) The CCT rating for a lamp is a measure of warmth or coolness of its appearance Below 3200 K - warm (yellowish- white) Between 3200 and 4000 K - neutral Above 4000 K - cool l(bl (bluish-white) hit 2009 Rensselaer Polytechnic Institute. All rights reserved. 39 Regional Workshop on Energy Efficient Lighting (RCEEL)

40 Color Rendering Index CRI Light sources differ in their ability to render the color of objects correctly CRI = 90 CRI = 70 CRI = Rensselaer Polytechnic Institute. All rights reserved. 40 Regional Workshop on Energy Efficient Lighting (RCEEL)

direction Provided d in photometric t reports Unit: candela (cd cd) 2009 Rensselaer

42 Intensity (Candlepower) Light emitted by a source in a specific direction Property of the source, it remains the same regardless of distance Many intensities depending on the direction Provided d in photometric t reports Unit: candela (cd cd) 2009 Rensselaer Polytechnic Institute. All rights reserved. 42 Regional Workshop on Energy Efficient Lighting (RCEEL)

44 Luminaire Efficiency Percentage of initial lamp lumens that are ultimately emitted by the luminaire Efficiency = Lumens emitted by a luminaire Lumens emitted by the lamp(s) 2009 Rensselaer Polytechnic Institute. All rights reserved. 44 Regional Workshop on Energy Efficient Lighting (RCEEL)

45 45

46 Average Rated Life The number of operating hours when 50% of a large group of lamps have failed when operated at nominal lamp and voltage current Number of hours per start: Incandescent minimum impact Fluorescent - 3 hours per start HID - 11 hours per start 2009 Rensselaer Polytechnic Institute. All rights reserved. 46 Regional Workshop on Energy Efficient Lighting (RCEEL)

48 Thank you.

ZONING ORDINANCE. Table 1001-A1 Primary Building Area, Width, Story, and Setback Limitations

ZONING ORDINANCE. Table 1001-A1 Primary Building Area, Width, Story, and Setback Limitations Article X. HEIGHT AND AREA REGULATIONS Section 1001. District Regulations 432 485 534 548 564 565 432 444 485 534 548 564 565 633654 2016-04 District height, area and other regulations are shown on Table