That's a great price. I initially had the gooseneck version but it tended not to stay in place. Instead opted for this clip-on version in white which sits just above the Reader. Same variety of brightness and hue options on both versions:
https://www.amazon.com/Glocusent-Rec...st_sto_dp&th=1
The Glocusent lights from my experience introduce new usability for the PRS-505. I'm also using a PRS-650 which I picked up lightly used earlier this year. Thankfully it came with an original Sony case, so use the Glocusent for that one too. Cases for most of the older Sony Readers seem really difficult to obtain. If anyone on this forum has older Sony Reader cases for sale, I'd be very interested.
Let us know how it goes with the Glocusent light.