Set E, Good Lighting Slide Set:

Set E

#1
Fireworks: one type of outdoor lighting. Not a real problem relative to glare, light trespass, or sky glow. Neither is most holiday lighting or other such low level lighting applications that are not designed for safety, security, or such applications.
#2
A "typical" street or parking lot lighting situation: too much glare, not a good level of lighting distribution on the ground. It is using a good deal of energy, much of it wasted. We can and should do better with all outdoor lighting. It is there for a reason, and we should use both energy efficient lighting sources and quality lighting design.
#3
The major types of lighting that we see used for outdoor lighting. They vary greatly in their energy efficiency. All of these sources are discussed in some detail in various IDA information sheets, and elsewhere in the lighting literature, but we also note them here: Incandescent is the ordinary kind of light bulb. Fluorescent lighting is used mostly for interior lighting, but more and more for outdoor lighting. Quartz lighting is a type of incandescent lighting. Metal halide is a high intensity discharge (HID) type lamp, and it is the most efficient of the "white" lights. Mercury vapor (MV) Hg Vapor lighting (another HID source) is the commonly seen harsh, bluish-white light. High pressure sodium (HPS) is also an HID lamp, very energy efficient. Its light is orange or amber looking. Low pressure sodium (LPS) is a tube source, rather like the fluorescent tubes. It is the most energy efficient.
#4
Data comparing the common 175 watt mercury vapor lamp with a 55 watt low pressure sodium lamp. The two have about the same amount of light output.
#5
A chart showing the source of electricity production in the U.S.A.
#6
A chart showing the electricity usage in a number of countries.
#7
"We Waste Over One Billion Dollars Annually Lighting Up the Night Sky."
#8
The idea of a spectrum. This is a photo of the Moon taken with a small transmission grating placed in front of the camera lens. White light is made up of many colors. The spectrum of an incandescent lamp is rather like the spectrum of the Moon, which is actually a spectrum of sunlight reflected from the Moon, of course.
#9
The spectral output of a typical fluorescent lamp.
#10
The spectral output of a mercury lamp.
#11
The spectral output of a high pressure sodium lamp.
#12
The spectral output of a low pressure sodium lamp.
#13
A photo of a street in Redwood City CA, with a transmission grating in front of the camera lens. One can see the spectral output of a wide variety of lighting sources in this photo, including that of low pressure sodium street lights.
#14
Low wattage LPS lighting being used for parking lot and security lighting.
#15
LPS being used for fence lighting at a federal prison. Very effective lighting job.
#16
LPS being used in full cutoff fixtures for walkway lighting at a major hospital.
#17
LPS lighting at the same hospital (slide #16, above), seen from above. Full cutoff fixtures on the left, less efficient fixtures on the right. These have since been replaced with full cutoff ones.
#18
LPS being used for parking lot lighting, both enclosed and open deck. The ones on the top deck are full cutoff. Notice the lack of glare, and the dark sky even in the immediate vicinity of the fixtures.
#19
A major freeway in Europe lit with LPS, a "catenary" design, not used in the U.S.A., but very good for this application. Notice the good lighting and the roadway guidance.
#20
A full cutoff LPS street lighting fixture. They give excellent light output control, there is no glare, and no confusion of the yellow LPS with the yellow of the traffic signals.