Let me do the horrible: try to explain the thing.
The joke isn't that this person is all grown up and can buy whatever he likes.
It's in the numbers. 25000 hours is approximately 7 years (if using the lamp only at night). So, either he should've outgrown the fear of dark by the age of 10 (at most), or if the fear is acquired, which is most likely the case, he now has only 7 years of sweet Spöka night time protection.
That's it. I hope you get it.
Apparently, being scared of the dark your entire goddamn life is a thing. Buy yourself night lights, big kids. Just not Spökas, please. I have very spoopy ghost stories about those :'-)