do mirrors multiply total lumens? physics broken

Basically the farther light travels the more energy it looses. (distance not displacement)
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Light does not lose energy as it travels, a mirror may not give back what energy it receives but light does not lose energy, it contains no mass not that that means jack.
 
Answers on here are hilariius man, from light losing energy to iinfinty not existing, id say you couldn't make this up but read above.
 
But if you had a room of mirrors and turned the light on then back off quickly, letting the light bounce around until it died out, then turn the light back on and off for a second, and so on, you might save a couple cents on electricity?
 
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