Luminous Flux Converter
Convert lumens, lux, watts with distance support
光束変換
照度(ルクス)計算時に使用
変換結果
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変換結果
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一括変換結果
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▶ 換算表
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メモ
About Luminous Flux Converter
The Luminous Flux Converter converts your input to a shared reference unit (lumens) and then recalculates every supported unit from that base.
Since the relationship between luminous flux (lumens) and illuminance (lux) depends on distance, you can optionally specify distance to calculate lux accurately for a point light source: lux = lumens / (4π × distance²).
When conversions are approximate rather than purely linear—such as watts to lumens—explanatory notes are included so the tool remains practical for learning and quick reference.
How to use Luminous Flux Converter
- Enter the number you want to convert
- Choose the source unit from the dropdown (lm, cd·sr, W, lux)
- For luminous flux units, optionally specify distance (meters) to auto-calculate illuminance (lux)
- Review the converted values for all supported units in the results table
- Check 'Batch Mode' to convert multiple values at once
Benefits of Luminous Flux Converter
- Shows all supported units side by side to reduce conversion mistakes
- Distance parameter instantly calculates illuminance—essential for lighting design
- Updates in real-time as you type for quick comparison and adjustment
- Includes notes when conversions are approximate rather than strictly linear
- Batch mode processes multiple values efficiently
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