I found these:
https://www.amazon.com/gp/product/B01D3SKICK/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=
Putting one the ceiling would be cheaper, safer and more maintainable.
I am not yet 100% certain but this bulb would probably do well:
10 W × 24 would be 25% - 33% the energy use.
Edit:.
Also very much thanks to @AK-Adventurist for trying to provide useful information