I did some test in 0.15 and it doesn't seem like this mod is usefull anymore.
The sprite for the flashlight is still the same size as before but they changed it since 0.14 and I guess they must have changed the way the light is rendered too. Because even at max zoom I can't see any pixelation (with maximum lighting quality that is).
If you think that it would be usefull to you, just contact me on the forum. Like maybe you want to use low lighting but still have high quality flashlight ¯\ (ツ) /¯. I'm not going to update this for 0.15 untill I can find a use for it.
Vanilla texture is 200px large, mine is 1000px large.