Questions on effect between 1W and 3W LED

[vincegoh]

I am wondering whether is the effect of 3 number of 1W LED equal or more than 1 number of 3W LED.

Can any lightings expert comment on this?

Thank you.

[fishiee]

assuming the output of light per watt for both bulbs are the same, they both should produce the same ammount of light. However, if you are working with a large tank, i would advise 3 bulbs, its pretty hard to angle the one bulb to illuminate the enitre tank.