From what I have read low pressure sodium puts out approx 180 lumens/watt so a 100 street light would be 1800 lumens, a 400 watt bulb would be around 72,000 lumens using that figure.
The purpose of street lights is to illuminate the surroundings – including the road and adjacent areas in a manner that human beings using the area can adequately perceive the area and its surroundings. Street lights are thus a vital instrument in ensuring safety from accidents and unsocial elements. Indeed in several studies street lights have been linked with feelings of safety and reduction in accidents.
One day in the not too distant future, the familiar orange and yellow glow of a streetlight may become nothing more than a distant memory. Why? Cities en masse are switching to brighter, whiter LED streetlights, and Cree has a new low-cost LED that could accelerate municipal adoption of these highly efficient illuminators.
Starting at $99, the new Cree LED residential street light comes in two flavors — 25-watt (2,722 lumen) and 42-watt (4,109 lumen) — that uses 65-percent less energy than the common high-pressure sodium streetlight. Cities can replace up to 100-watt streetlights with these LED units, and Cree notes that the light could deliver payback in less than one year.
This mainly depends on how much lumens per w is the single led bead of your solar street lamp, and then how about the light output rate of the reflector of the lamp? Generally speaking, according to the light output rate of 70%, lumens should be around 6500 to 8000. It is recommended that such a large power led headlamp light source should be 1w, and each one should not use the integrated module light source. The heat dissipation is not good, and the light attenuation is more, but it is the trend of lighting in the future.
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.
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