Sorry if you actually explained this already but I feel like I'm still missing the point here. I understand that the number of available energy levels has to be limited because quantum theory means that there has to be an integer amount of photons with that energy, but why does it have to be low? Or is the fact that it's low more to do with the intensity of radiation and peak wavelength of radiation is dependent on the temperature of the radiator and bc it releases a continuous spectrum of light across all wavelengths the intensity has to shoot down dramatically from it's peak to zero?
Refer back to my post again, it's a probabilistic thing. A photon at very low wavelength is one with very high frequency and as frequency is prop to energy, it means that for an oscillator to emit radiation at that range, it requires an excessive amount of energy which is distributed as a discrete quantity i.e an energy packet which is very unlikely.
This is why the classical models failed since it assumes that the continuous nature of light and this means that these energy outputs can be reached over time. It also means that in theory energy transmitted can be unbounded which violates conservation laws and this was the UV catastrophe, in that Rayleigh Jeans law and the classical models failed to accurately describe the energy distribution of a blackbody.
The quantised nature of light elegantly resolves this dilemma as it means that an excessive amount of energy must be emitted in the form of an energy packet instantaneously, hence the blackbody oscillator must already have an excessive amount of energy as to radiate at very low wavelengths which by intuition is extremely rare.
Does this make sense from an intuitive level? I assume that's what you want rather than mathematical explanation. Please consider Rayleighs curve, Planck's law, wavelength vs intensity graph of a blackbody etc. when thinking. Planck's law E = hf implies the energy frequency relationship.