Lighting-related block variables

[AntherusCraft]

So you mean the "setLightOpacity" in client = "m_SpreadLightFalloff"?
But for example: When you place a glass block directly next to a glowstone, the light shines still 15 blocks wide, because it shines through the glass because the LightOpacity in the client is set to 0.
The MCServer says that the LightOpacity is 1 so when you place a glass block next to a glowstone it still shines through BUT only 14 blocks wide.
Isn't that completly wrong?