calibration lamp

Robin Leadbeater

Yep the good old Relco 480  (but possibly gold plated given the price !)  To be fair though, I believe there is a lot of variability so Shelyak select the better ones and discard the rest. Starlight Xpress use it in their spectrograph too. A great discovery by Richard Walker who should be on commission!  My first  tests with it in the LHIRES are here