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Tank lighting question...

Kalib

By Kalib,
in New to the Marine Aquaria Hobby

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Kalib

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Ok, nothing to do with how much light i need for my tank:D but rather this is a question regarding the actual power of lights.

Today in a conversation i had, my friend told me stuff about lights and explained using physics. Well i was totally stumped by what he's saying because what he says seems to confuse me greatly. So basically, from what i can understand from what he says, he's telling me that 2x25W FL is weaker than 1x30W FL.Its like the wattage doesn't add up,1x30W will still be stronger than 2x25W FL.Is that true?

Only thing i didn't clarify with him was, did he take into consideration how light reacts with water(colour spectrum disappears as depth increases).

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