Jesper
New member
Here is a chart of how human eyes see the light emitted by ideal black body radiators depending on temperature in Kelvin...
Colour Temperature Chart
That is how the human eye interprets the the full spectrum, however if you look at a chart of intensity distribution over wavelength for the same light source you will find that the intensity can peak pretty much anywhere(there are several peaks..}, however the main part of the AUC tend to be in the blue to green yellowish range... Say 400 to 550nm.
This is the reason for the confusion, some ppl call the light yellowish green, some blue because some brands have large peaks at those wavelengths, the overall spectra should appear bluish white (to the human eye} in all cases though(6500K}.
Either way 6500K is a good plant light, it gives quite a lot of energy at 450nm which is one of chlorophylls absorption peaks.
A higher colour temp bulb(say 10000K} will generally emit a larger peak of light at say 450nm and less light at 550nm, that the only difference, i.e. a much more narrow spectrum.
Either way it might be a good idea to complement with a light source that emits at 650 to 700nm where the other clorophyll absorption peak is situated..
Colour Temperature Chart
That is how the human eye interprets the the full spectrum, however if you look at a chart of intensity distribution over wavelength for the same light source you will find that the intensity can peak pretty much anywhere(there are several peaks..}, however the main part of the AUC tend to be in the blue to green yellowish range... Say 400 to 550nm.
This is the reason for the confusion, some ppl call the light yellowish green, some blue because some brands have large peaks at those wavelengths, the overall spectra should appear bluish white (to the human eye} in all cases though(6500K}.
Either way 6500K is a good plant light, it gives quite a lot of energy at 450nm which is one of chlorophylls absorption peaks.
A higher colour temp bulb(say 10000K} will generally emit a larger peak of light at say 450nm and less light at 550nm, that the only difference, i.e. a much more narrow spectrum.
Either way it might be a good idea to complement with a light source that emits at 650 to 700nm where the other clorophyll absorption peak is situated..
Last edited: