› Forums › Spectroscopy › What wavelength error is acceptable with an Alpy? › Lamp illumination
29 October 2018 at 11:39 pm
#580135
![](https://britastro.org/wp-content/uploads/2017/12/picture-8167-1513728374-80x80.jpg)
Participant
The reflector isn’t perfectly straight and the bulb emits light from one side of itself.