LED Street Lamp Question

The standards of lighting are usually determined by code, which depends on road use, location, speed limits, and other variables....Here is some guidance to get you started....

http://www.iamu.org/documents/filelibrary/energy_services/energy_efficiency/LED_Street_Light_FAQs_67ABA43746148.pdf

https://electricalnotes.wordpress.com/2014/06/02/calculate-street-light-poles-distance-fixture-watt-lighting-area/

http://www.leotek.com/education/documents/Leotek.LED.Streetlight.Guide.V7-101613.pdf

http://www.lightingwizards.com/Downloads/LED_vs_Induction_Streetlights.pdf

I'm curious if you were given this assignment without any in-class preparation or supporting material.

No. You do not provide enough information.

Did you notice the CR4 homework policy?

• Do your own homework. CR4 is not a homework cheat site. While some here might relish the opportunity to sharpen up old rusty skills by working the homework problem, consider the following and consider it well. If you cheat on your homework by using someone else's answers, you are only cheating yourself, because the purpose of any homework or other academic assignments is to help you learn - by practice, repetition, and self-discovery.

Fred, FRED!

Silly goose!

In order for one to notice the CR4 homework policy, one would have to read the CR4 Rules of Conduct and the CR4 FAQs.

That would mean wasting time on useless rules when all the student wants is the answer to the assignment.

Rules, FAQs, and in-class preparation all take time away Grand Theft Auto and Game of Thrones.

I know, I know. My comments are an exercise in futility. A senior student so well practiced at retaining nothing will not listen to my scolding. However, by posting the homework rule I can hope other members will let this thread go unanswered.

Maybe the poster should read the assignment and the materials first.

Thank you @solarEagle, by sending some documents about Street lighting system, my question is the way how to calculate the illumination of LED Street lamp. For instance, Look at this formula : E=(LL*CU*MF) /(S*W) Where; LL = Lamp Lumen CU = Coefficient of Utilization MF = Maintenance Factor S = Spacing between poles W = Roadway Width E = Average illuminance If you look at this formula the data I have is S and W only. The required lamp lumen have to be found, Now my question is, how calculate LL having only S & W? In addition, CU & MF are the ranges. From these ranges what values do I use.? Also, if you want to find the wattage of the LED lamp or any lamp, you have to know the efficacy (lumen per watts) which range from 60 to 170 for Led lamp. What value of efficacy I have to use from 60 - 170?

The light manufacturers should provide the lighting characteristics for each design of commercial lighting fixture and model....This will include width and depth of light cone of illuminance...and lumens or candela range at particular height....You must then determine your fixture type and wattage to suit the design needs such as 1 lumen per square meter minimum, as well as the maximum directly under the light....The height specified does not limit the arm extension that can be used to better position the light over the road for maximum efficiency....

http://en.wikipedia.org/wiki/LED_street_light

http://ledlightingbysavwatt.com/page/857/250w-6-module-led-street-light-300-480-vac-cool-white

http://www.idot.illinois.gov/assets/uploads/files/doing-business/manuals-split/design-and-environment/bde-manual/chapter%2056%20highway%20lighting.pdf

Brilliant!

seems like a run way airport--the road you mean? It depends on what activity and purpose of lighting you want to have with your design.