ELECTRICAL DESIGN

Number of light lamps can be determinate with calculation using :

DEMO:
http://testtesttest.ddns.net:8383/apex/f?p=130

switchboard single line diagram

estimated values E
kitchen 250 [lx]
dayly room 250[lx]
sleep room 60 [lx]
toilets 120 [lx]

k room factor = (a*b)/(h1*(a+b))

h1= h total - h lamps - h2
h2 apps 0.9 [m]

Luminous flux

FLUX=(E * a * b) / (ni * f) [lm]

where f=f1 * f2 (0.9 cleanest and oldest)
and ni is parameter and can be determine from tables (0.2- 3)

Number of lamps = FLUX / unit lamps from tables (for example 1000 [lm]..)

Light really intensity

E= (n * n lamps * FLUX o * ni * f)/(a * b) [lx]