Lux Calculation - Workshop Project

dear,

are you a student ? or design engineer ?

1. 8 mtr. height fitting - mostly recommended is 250 W, for better results.

2. Let us design for 150 W as you have suggested.....

Distance / Span between 2 poles - as recommended by manufacturer catalogue - 2.5 - 3

For economical designs, let us select span = 3 mtr.

Lux level require for street lights - is normally between 40 - 60

Let us select our requirements - 60 lux.

With 150 W HPSV - lumens out put = 14500 lumens.

Consider the road width = 100 mtr. ( Area = 600 sq mtr. )

No. of fittings & poles N = 60 *600/(14500*0.4) = 6 with span of 100/5 = 20 mtr. with span <3

( this is very simple calculation, assuming the uniform light being falling all over the area.)

What is the size and shape of the downlighter reflector and the downlighter diffuser?

What is the efficacy of the lamp?