Artificial lighting scheme


I am planning to use two diffferent kind of lights, mercury vapor for the sturctural tubes and LED lights.

section_lighting.jpg


mercury.jpg

Mercury vapor (ED28) Philips (Inside structural tubes)

Color Rendering Index: 20
CC Temperature: 6700
Lumens: 12,100
Lamp life hour: 24,000







ReflectorPar38.jpgLED lights (The Lumicrest 9 PAR38 Reflector)

Power: 14 Watts

Lamp life hour: 45,000 hours
Beam Spread: 40 degree
Light Color: Warm White (2800K)
Lumens: 1800

gallery.jpg

GALLERY SPACE


Cavity Ratio of the room (CR)
hRC = 8’ hCC= 2’ hFC = 3’
CR = 2.5 x area of cavity wall / area of work plane
= 2.5 x 2h x ( l x w) / area of work plane
= 2.5 x 2 x 8 x ( 75 x 30 ) / 1894
CR = 47.5
RCR = 5 h RC [ (I +w) / (I x w)]
= 5 (8) [ (75 + 30) / (75 x 30)]
RCR = 1.8
FcR = 5 h FC [ (I +w) / (I x w)]
= 5 (3) [ (75 + 30) / (75 x 30)]
FcR = 0.7
CcR = 5 h CC [ (I +w) / (I x w)]
= 5 (2) [ (75 + 30) / (75 x 30)]
CCR =0.46

Pcc.jpgpercent_ceiling_Pc.jpg

Initial reflectance:

Ceiling: 70%
Wall: 50%
Floor: 20%
Therefore,
PCC = 29
PFC = 60

room_cavity.jpg
Fixture CU value: 0.53

numbers_of_fixtures.jpg

From the chart above, it is calculated that 48 fixtures will be needed in that specific part of the gallery.

CANDLE POWER DISTRIBUTION

candlepwoer.jpgfootcandle1.jpg
From the candle power distribution chart, we found out from 25 degrees, candela of the LED light is around 1250, which from the table calculated 28 footcandle.