Anyone tried LED light?

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some people put those on their trucks/cars . . . . and they call them, "line of fire LEDs"
 
I assume these are just lights to provide light, plants would still need another light source for their growth right?

Also, can LED be left on during the time the regular lights are not on?

Reason why I ask, my one tank seems to act as a night light to the other people in the house :(
 
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