<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def lambda_max(self):
 """Peak wavelength in Angstrom when the curve is expressed as power density."""

        return ((const.b_wien.value / self.temperature) * u.m).to(u.AA).value