# Is it worth learning the Planck’s law to use a blackbody?

No need for you to learn the Planck’s law by heart!

However it is good to know some important properties of blackbodies as consequences of the Planck’s law:

- For any given wavelength, the Radiance level is an increasing function of the temperature,
- For any given temperature, the
**Spectral Radiance**curve reaches a maximum which wavelength can be easily calculated from the easy-to-remember**Wien’s law**

Example: a blackbody at 800K (i.e. 527°C approx.) emits its maximum radiation at about 3.6 µm, i.e. in the MWIR spectral range.