....or, one of these in the appropriate size.
https://www.ebay.com.au/itm/LED-Rece...r=551432557824
I use one and the light is very evenly distributed. They are a little bright for me though so I have stuck about 5 sheets of A4 paper over it to dim it a little.
I just point the scope straight up and sit the light on top of it....easy