Table 1. Light levels from streams in the Berlin metropolitan area.
Light levels measureda at various water bodies in the Berlin area at 50 cm depth, and in the flumes at 20 cm depth, with moonlight light levels for comparison.
| Location/Flume/Moon | Light level (lx) |
|---|---|
| Flume 8 | 0.0000 |
| Ullsteinstraße | 0.0000 |
| Alt-Gatow | 0.0395 |
| Stralauer Allee | 0.0403 |
| Flume 7 | 0.0420 |
| Borsigturm | 0.0434 |
| Seestraße | 0.0434 |
| Großer Spreering | 0.0537 |
| Schäfersee | 0.0614 |
| Flume 6 | 0.1040 |
| Hauptbahnhof | 0.1123 |
| Flume 5 | 0.2800 |
| Full moon, clear sky, temperate latitude | 0.3 |
| Müggelseedammb | 0.3183 |
| Friedrichstraße | 0.4288 |
| Flume 4 | 0.5860 |
| Flume 3 | 1.3100 |
| Kupfergraben | 1.4000c |
| Flume 2 | 4.1850 |
| Flume 1 | 416.000 |
Notes.
a
All readings were taken with an ILT1700 light meter with the light sensor held vertical.
b
This measurement was taken directly below a light on a bridge.
c
This measurement was taken at a water depth of 40 cm; a measurement at 20 cm in this same location was 2.500 lx.