You did not take into account the energy to create those headlamps, and to replace worn batteries. I estimate each headlamp uses as much energy as a 15 watt lamp burning continuously for a year.
Depending on how much they use them (they probably last around 500 hours before being worn out) they may come out ahead or behind, but it's not a slam dunk.
> plus extra for heat extraction
To extract the heat takes 1/3 as much energy as was emitted, if that helps your calculations.
I also didn't include the energy (or cost) to create thousands of fluoro tubes, nor the human wages paid to constantly replace the ones that go... which is going to be far more than a couple of headlamps you can buy from the $1 store and some rechargable batteries.
> Depending on how much they use them (they probably last around 500 hours before being worn out) they may come out ahead or behind, but it's not a slam dunk.
I agree that 'how much you use them' is important. None of us really know how often they are accessed, but to me even for a very heavily accessed facility it does feel like a 'slam dunk'. If you feel the opposite maybe we just disagree here.
I'm not sure what wears out after 500 hours by the way: Batteries? LED lighting? Neither are going to cost an arm and a leg.
Depending on how much they use them (they probably last around 500 hours before being worn out) they may come out ahead or behind, but it's not a slam dunk.
> plus extra for heat extraction
To extract the heat takes 1/3 as much energy as was emitted, if that helps your calculations.