White light discussion tends to focus around spectrums of perceptual/blackbody/the sun importance because... well, it's just the natural choice. Is there a name for a light source which has a constant emission intensity across a given range of wavelengths? Does such a thing have any practical purpose (beyond being interesting to think about) and do we actually make anything capable of producing such light output? I suppose one way might be to take some incandescent source and then stick a really well tuned filter in front to "level out" the normal curve, but that punts the problem to constructing such a well tuned filter.

> Is there a name for a light source which has a constant emission intensity across a given range of wavelengths?

The issue with this is that you can’t necessarily define ‘constant’ in a meaningful way. Being a density function rather than a point function, the energy irradiance from a source changes changes depending on whether you measure in terms of wavelength or frequency. I recommend [0] as an introduction to the problem.

[0] https://oceanopticsbook.info/view/light-and-radiometry/level...