Quick Answer
The cie standard overcast sky daylight factor calculator computes daylight factor from the input values you provide.
Calculator
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Find Engineering Solutions →Result Interpretation
CIE Standard Overcast Sky Daylight Factor Calculator computes Daylight Factor in % using the defined engineering formula and the input values provided. Daylight Factor is expressed in %. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Indoor Illuminance = 150
- Outdoor Illuminance (Standard Overcast Sky) = 5000
Expected Result:
- Daylight Factor = 3
Engineering Interpretation:
Under the given input conditions, the calculated result is: Daylight Factor = 3 %.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.
Formula / Method
daylight factor = (indoor illuminance / Standard Overcast Sky) * 100.0Daylight Factor.
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| illuminance_indoor | Indoor Illuminance | INPUT | Indoor Illuminance |
| illuminance_outdoor | Outdoor Illuminance (Standard Overcast Sky) | INPUT | Outdoor Illuminance (Standard Overcast Sky) |
| daylight_factor | Daylight Factor | OUTPUT | Daylight Factor |
Calculation Steps
- Enter the indoor illuminance in lx.
- Enter the outdoor illuminance (standard overcast sky) in lx.
- Step 1: Compute daylight factor.
- Read the daylight factor (%) from the results.
Frequently Asked Questions
What does this calculator calculate?
The CIE Standard Overcast Sky Daylight Factor Calculator estimates Daylight Factor based on the input parameters you provide
Why is indoor illuminance important in this calculation?
indoor illuminance is directly proportional to daylight factor. When you enter indoor illuminance in lx, the calculator uses it in the engineering formula to compute the output
How should I interpret the result daylight factor?
The calculator outputs daylight factor in %. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Indoor Illuminance (lx), Outdoor Illuminance (Standard Overcast Sky) (lx). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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