OK maybe this might be a little more useful. 20 years ago we used to row a small dingy (much like cams but fibreglass) round the rangitata and rakaia lagoons spearing flounders. We used a 55w driving light to which we applied silicone anywhere it looked where it might leak mounted 1-2 feet under the water facing fwd , obviously, worked way better under the water than spotlight shone from above.
I guess now you can buy ones which are more technically advanced
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