its probably the same thing but i think its the reflections that is the problem and not the light itself.
if the water is transparent so the light shines on the sub hull so because of this same transparency it has no light reflection of its own
the reflection is also going to effect transparency for other things such as lights shining through objects too. the same may happen with starshells shining through ships and thats why they dont get illuminated by them
if i had to guess i would say the lighting is ok but the way things reflect the light is the key to a more realistic look
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