Arwin has posted a sample of the PSPGL project he has been working on for the last month or so:

Ok, here's the rough code, a sample PSPGL targeting main.c (heavily borrowing from the ported NeHe sample lesson 6, I didn't even remove the texture yet) that implements gltextlight through header file, all included.

Here's the link: http://www.niwra.nl/psp/gltextlight/gltextlight.rar