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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.

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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.

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The illumination level required as per **ISI (Indian Standards Institution) standards** for various working planes in residential buildings is typically measured in **lux** (a unit of illuminance). Here are the recommended values:

1. **Kitchen Sink**: 150–300 lux  
   - This is a task-oriented area requiring good lighting for washing and food preparation.

2. **Staircase**: 100–150 lux  
   - Sufficient lighting is required for safety while using the stairs, but not as bright as task-oriented spaces.

3. **Dining Room**: 100–150 lux  
   - General ambient lighting for a comfortable dining environment is needed.

4. **Study Room**: 300–500 lux  
   - Higher illumination is necessary for reading and writing tasks.

These values help in providing a comfortable, functional, and safe lighting environment as per ISI standards.
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According to the Indian Standard IS 3646 Part 2 for illumination levels in residential buildings, the recommended illumination levels (in lux) for various working planes are as follows:

1. **Kitchen Sink**: 200 lux
2. **Staircase**: 100 lux
3. **Dining Room**: 150 lux
4. **Study Room**: 300 lux
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