Chapter 1 Tutorial illumination

8/9/2019 Chapter 1 Tutorial illumination

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CRITERIA IN MANUALCALCULATION

&#-ug-2&1# EEE /#2$ Eletri :ower ;tili'ationan) 5llumination (. /emi8 EEE < 5 =epartment

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Calculation by Lumen Method:

*he average illuminane pro)ue) ,! a lighting installation or the num,er ofluminaires require) to ahieve a spei9 average illuminane8 an ,ealulate) ,! means of utili'ation fators. *he average illuminane Es over a

referene surfae s an ,e alulate) from the >lumen metho)? formula.

F x n x N x MF x UF s

Es + ------------------------------

area of surfae s

where / is the initial ,are lamp 0ux lumens8 lm

n is the num,er of lamps per luminaire

N is the num,er of luminaires

;f s is the utili'ation fator for the referene surfae s

@/ is the maintenane fator )irt! &.$8 normal &.8 lean &.7



CRITERIA IN MANUAL CALCULATION


$

ample :ro,lem

@r. Aru' wants to light up his new warehouse in Laguna. *he warehouse

measures 2&m x 3&m. He wants to mount his luminaires on the trusses ma,ove 9nish 0oor line. What t!pe of luminaire will he use an) how man! ofthose will he purhase"

Biven L + 2&m8 W+ 3&m8 H + m8 @/ + use &.(e0etanes use )efault A + &.$ W + &.% / + &.2

olution *o o,tain ;/8 solve for (oom 5n)ex (5 + CLDWHw8 (5 + 1.%

(equire) verage 5lluminane Eave for warehouse as per stan)ar) is 1&& lux




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olution ont.

ine mounting height is m8 use high ,a! 9xture./rom ;/ ta,le of *horn High 4a!8 ;/ + &.$

u,stituting to equation F x n x N x MF x UFs

E + ------------------------------ 1&&6&&

N + ------------------------------- 2$%&&1&.&.$

N + 3.#78 use # sets 2%&W N-* high ,a! lighting 9xtureAheFing the lighting level8 E + 11#.# lux

Chapter 1 Tutorial illumination

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