Under waterlights

[The Hillbilly Barge]

I'm looking at underwater lighting and noticing that some have them facing down and some facing rearward off the back of the pontoons, is this just preference or based on the type of light

 

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When I bought my Bennington it came with the lights facing down. Possibly those that are facing out may be aftermarket add ons. Haven’t seen a side by side comparison so not sure which I would prefer