
The light can be omitted, set to zero intensity and size, use_fuel_glow_color can be set to false, but the light gonna light. In color.
working_light_picture seems to respect the use_fuel_glow_color setting, but the light is stubbornly ignoring everything.
Removing fuel_glow_color from each of the fuel-cell prototypes however brings this result:

Please to let me turn off the area light, I want nice colored new lights. :C