Electrical Thumb Rules-Illumination-(Part-19).


Recommended Lighting Levels For Sports Areas  

Bowls20 lux50 lux100 lux150 lux
Tennis50 lux100 lux150 lux250 lux
Football50 lux100 lux250 lux450 lux
Cricket Outfield50 lux100 lux250 lux450 lux
Cricket Pitch100 lux200 lux400 lux600 lux
Hockey50 lux100 lux250 lux350 lux
Swimming50 lux100 lux150 lux250 lux


Industrial & Office Applications Lux Level

General EngineeringRough Work160 lux
General EngineeringMedium Work400 lux
General EngineeringFine Work800 lux
General EngineeringVery Fine Work1600 lux
Inspection AreasRough Work160 lux
Inspection AreasMedium Work320 lux
Inspection AreasSub Assemblies400 lux
Inspection AreasFine Work, electric & high precision mechanical800 lux
OfficesEntrance halls and receptions areas160 lux
OfficesConference facilities, general offices, typing and filing500 lux
OfficesComputer and business machine operation630 lux
OfficesDrawing Offices800 lux
Outdoor AreasMechanical loading10 lux
Outdoor AreasManual loading10 lux
Outdoor AreasService station forecourts160 lux
WarehousingInactive storage20 lux
WarehousingLoading bays and large materials storage100 lux
WarehousingSmall material storage, packing and dispatch200 lux


Recommended Lighting Levels

Characteristics of ActivityRepresentative ActivityIlluminance (lux)
Interiors rarely used for visual tasks (no perception of detail)Cable tunnels, nighttime sidewalk, parking lots50
Interiors with minimal demand for visual acuity (limited perception of detail)Corridors, changing rooms, loading bay100 – 150
Interiors with low demand for visual acuity (some perception of detail)Foyers and entrances, dining rooms, warehouses, restrooms200
Interior with some demand for visual acuity (frequently occupied spaces)Libraries, sports and assembly halls, teaching spaces, lecture theaters300
Interior with moderate demand for visual acuity (some low contrast, color judgment tasks)Computer work, reading & writing, general offices, retail shops, kitchens500
Interior with demand for good visual acuity (good color judgment, inviting interior)Drawing offices, chain stores, general electronics work750
Interior with demand for superior visual acuity (accurate color judgment & low contrast)Detailed electronics assembly, drafting, cabinet making, supermarkets1000
Interior with demand for maximum visual acuity (low contrast, optical aids & local lighting will be of advantage)Hand tailoring, precision assembly, detailed drafting, assembly of minute mechanisms1500 -2000+


Interior Light Levels

EnvironmentRequired Light Level
 Storage Area / Plant Room (minimal movement of people)150 – 200 Lux
 Construction Areas & Loading Bays (minimal perception of detail)300 – 500 Lux
 Factories & Kitchens (higher perception of detail)500 – 750 Lux
 Inspection, Welding, And Machinery (demanding work)750 – 1000 Lux
 Electronics & Textile Production (repetitive detail)1000 – 1500 Lux
 Technical Offices (accurate detail)1500 – 3000 Lux
 Jewelers & Goldsmiths (precision detail)3000 + Lux


Outdoor Light Levels

EnvironmentRequired Light Level
Very Bright Summer DayUp To 100,000 Lux
Overcast Summer Day30,000 – 40,000 Lux
Floodlit Football Match700 – 16,000 Lux
Shady Room In Daylight250 – 300 Lux
Night Light On A Building60 Lux
Night-Time Urban Street10 Lux
Night-Time Car Park1 Lux
Security Floodlights700-1300 Lux
Shed Lights150-300 Lux
Lamp Posts120-180 Lux
Landscape Spotlights120 Lux
Outdoor Path Lighting100 Lux
Path lighting.100 Lux
Landscape Lights100-300 Lux
Garden lights20 Lux


Illumination Level

Light levels as per IS 1944
Classification of RoadType of roadillumination (lux)
Group A1Important traffic routes carrying fast traffic30
Group A2Other main roads carrying mixed traffic, like main city streets, arterial roads, throughways etc15
Group B1Secondary roads with considerable traffic like principal local traffic routes, shopping streets etc8
Group B2Secondary roads with light traffic Important traffic routes carrying fast traffic4


Illumination Level

Average Maintained Illuminance
High luxMedium luxLow lux


Interior Lighting Level

Chartered Institute of Building Services Engineers CIBSE  Part 2 (2002)

Illuminance (lux)ActivityArea
100Casual seeingCorridors, changing rooms, stores
150Some perception of detailLoading bays, switch rooms, plant rooms
200Continuously occupiedFoyers, entrance halls, dining rooms
300Visual tasks moderately easyLibraries, sports halls, lecture theatres.
500Visual tasks moderately difficultGeneral offices, kitchens, laboratories, retail shops.
750Visual tasks difficultDrawing offices, meat inspection, chain stores.
1000Visual tasks very difficultGeneral inspection, electronic assembly, paintwork, supermarkets.
1500Visual tasks extremely difficultFine work and inspection, precision assembly.
2000Visual tasks exceptionally difficultAssembly of minute items, finished fabric inspection.


Illumination levels of Switch Yard

AS/NZS 1158.3.1

Switchyard area lighting targetsIlluminance (lx)
HV areas including any overhead line road crossings and any access path zone type infrastructure10
Non-HV areas and general open areas5
Isolated areas such as back of buildings, corners of switchyards away from HV Equipment2


Sub Station Light Levels


EnvironmentRequired Light Level
CONTROL ROOM / Switch gear Room300
Battery Room150
Communication Room300
Offices/Engineers’ Room/Other Office Room300
Outdoor Switchyard area including road30
Road within campus including colony area30
Maintenance room150
Any other spot where high level of illumination required150
Dormitory & ‘C’ type quarters150
Auxiliary Buildings like Pump room and other houses150
ACDB- DCDB room/Store / Store Office150
Conference room300
Tiffin room/Kitchen150
GIS Hall150


Sub Station Light Levels


EnvironmentRequired Light Level
Control Room350
PLCC Room300
LT Room150
Charger Room150
Cable Gallery150
Heating Plant100
Battery Room100
Computer Room300
Entrance lobby150
Corridor and landing150
Conference and display300
Rest Room250
AHU Room100
DG Set Building150
Fire Fighting Pump House150
Switchyard – Main equipment50
Switchyard – general equipment and balance30