@Agatha @Heterokromia Thanks. I have a Singer 306 which is my workhorse. Can do everything!
@earthmothering9 @Heterokromia
So far I've used 2 packs of each of the following with no issues. (I even add lights to my treadles and handcranks whenever possible).
Picture shows an LED bulb on a handcrank.
Screw base
https://www.amazon.com/gp/aw/d/B07TVHJWJN?psc=1&ref=ppx_pop_mob_b_asin_title
Bayonet
https://www.amazon.com/gp/aw/d/B07MH813F8?psc=1&ref=ppx_pop_mob_b_asin_title
Bayonet (different brand)
https://www.amazon.com/gp/aw/d/B07PJ8SLWK?psc=1&ref=ppx_pop_mob_b_asin_title