.phyre files

[Ploaj]

LA8 most likely means luminescence and alpha.
So say the two bytes have values of
0x8C and 0xF0
"140" and "240"
Then the pixel would be
a = 240 //transparency
r = g = b = 140 //luminescence

They may be in a different order because of endianess, but I'm pretty sure that's it.