No clue. Would need a meter. And it's going to vary light to light. And I don't know that light well enough. I know myblights as I've metered them.If you guessed, what would the intensity need to be reduced to?
You could practice with a lux meter on your phone. There not gernarraly that good but you'll see what I mean.
Galactica lux meter for iPhone. Meter the lights in the kitchen first and bathroom. Then tank and out side too. It's a neat tool.