Question

Select the illumination level required as per ISI for the following working planes in residential buildings (i) Kitchen sink (ii) Staircase (iii) Dining room (iv) Study room.

Answer 1

As per ISI (Indian Standards, IS: 3646 Part 2) recommendations for lighting in residential buildings, the illumination level (also called lux level) required for different working areas is given in lux (which means lumens per square meter). Here's what is recommended:

1. Kitchen Sink – 300 lux  
   

   _(This is a working area, so good lighting is needed for safety and visibility while washing or cutting.)_

1. Staircase – 100 lux  
   

   _(Sufficient to see steps clearly and avoid accidents.)_

1. Dining Room – 150 lux  
   

   _(Moderate lighting is enough to comfortably eat and interact.)_

1. Study Room – 300 to 500 lux  
   

   _(Higher light level is needed here to avoid eye strain while reading or writing.)_

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