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The below table is a guide line for sizes of light pipe, light output and area they can cover :
| Size |
External light 1lakh to 1.1 lakh lux |
Area lit up
(approx.) |
Max. length |
| 250mm (10") |
450 lux |
150 Sft |
6 Metres |
| 400mm (16") |
1500 lux |
250 Sft |
8 Metres |
| 530 mm (21") |
3000 lux |
450 Sft |
12 Metres |
| 750 mm (30") |
5000 lux |
900 Sft |
Short Length |
Approx. out of 100 Watt bulb - 170 lux
Approx. out of 40 Watt fluorescent tube - 335 lux
(The actual amount of light produced by light pipe is variable depending on weather conitions, time of day, length of pipes and ambient conditions)
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