float light_f = (float)light / 255.0;
		light_f = pow(light_f, 2.2f); // gamma -> linear space
		light_f = light_f * light_amount;
		light_f = pow(light_f, 1.0f/2.2f); // linear -> gamma space
		if(light_f > 1.0)
			light_f = 1.0;
		light = 255.0 * light_f + 0.5;

replaced with:

		light = core::clamp(core::round32(light*sqrtf(light_amount)), 0, 255);