Street Light

Define “Street Lamp“. Depending on whether it is a residential street lights, a collector road, a major arterial or highway, not to mention pole height, spacing, etc. they are all different lumen levels.

Probably the most common is around 5000 lumens (at least in LED) used in residential areas. Collectors would be 7500-15000 depending on lanes, spacing, etc. arterials 15,000 – 25,000+, highways/highmast for highways 25,000 – 100,000.

HPS bulbs “can” have high lumens/watt, but their output decays quickly and the optical efficiency is poor because the source is so large and hard to focus.

How many lumens does your “standard”, low pressure sodium street lamp produce?

I have been looking everywhere, but i cant find it.

I KNOW is has to be a HUGE amount, because GE makes a high pressure sodium lamp, for homes, which, at 400 watts, will put out 51,000 lumens.From what I have read low pressure sodium puts out approx 180 lumens/watt so a 100 watt bulb would be 1800 lumens, a 400 watt bulb would be around 72,000 lumens using that figure.

Most street lights in North America use 250-400 Watt high pressure sodium lamps which produce up to 140 lm/w.I used to be a streetlight nut myself and here’s some info I remember when was in operation.

Well, to tell the wattage of a streetlight and the type of bulb it uses-look on the bottom of the fixture. Normally, you should find a colored lable with a number on it. Multiply that number by 10 and get the color of the lable

Blue-Mercury Vapor (bluish white)

Red- Metal Halide (bright white)

Yellow- High Pressure Sodium Vapor (Yellow-orange)

In my case, the streetlight in front of my house has a yellow lable and a 10 on it so it makes it a 100 watt High pressure sodium.

Note; Streetlights with wattages over 1000 watts will probably have X-1 on the lable instead of 100

MaxaBaker, that bulb is intresting; why does it have 2 arc tubes instead of one? Is one of them a backup?

in the UK, most street lights were high pressure sodium until recently. Popular wattages were 70 watts, 100 watts, 150 watts and 250 watts.

Metal halide lamps are used when colour rendering is of more importance.

Incandescent lamps were used up to about 1975 but are virtually unknown now.

Series street lighting was never much used in the UK, more of a USA idea. Arc lamps were used in series, often 8 or 9 or 10 arcs in series on DC mains of 400 volts, 440 volts or 480 volts. Arc lamps “went out with the war” as did most DC supplies though a few survived for longer.

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