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Light Perception - Results
At 80 cm height (with an intensity of 15 µmol
photons
29
−2 −1
⋅ m ⋅ s ), irradiance was
generally low and showed peaks at 600 nm and 900 nm, i.e. in the transition between green
and red and in the infrared region (beyond approximately 800 nm). At 60 cm height (with an
intensity of 24.3 µmol
photons
−2 −1
⋅ m ⋅ s ), irradiance was markedly increased, and the peak in
the infrared region could not be detcted anymore; wavelengths were obviously blocked below
450 nm. At 40 cm height (with an intensity of 55.7 µmol
photons
−2 −1
⋅ m ⋅ s ), irradiance again
increased, and also the peak in the infrared spectral area occurred again. From this height
(intensity) on, wavelengths were also propagated beyond 400 nm. At 20 cm height (with an
intensity of 304.4 µmol
photons
−2 −1
⋅ m ⋅ s ), irradiance was increased by five times compared
to the value from the 40 cm height measurement; thermal noise from beyond approximately
850 nm increased markedly. With the lamp positioned at 10 cm height above the fibre (with
an intensity of 604.5 µmol
photons
−2 −1
⋅ m ⋅ s ), irradiance increased again markedly. A distinct
peak could only be detected at 600 nm; thermal noise already occurred at 850 nm. The share
of photons in the blue spectral range (400-500 nm) lay between 7 and 14 %, in the green range
(500-600 nm) between 34 and 45%, and the red spectral range (600-700 nm) displayed the
highest spectral proportion with 42 to 60%. The white light spectra produced by the lamp
being positioned in 80 cm and in 10 cm height are given representatively in fig. A11 on the
following page. All other spectra can be found in the Appendix (AD).