Quoted from morbius4:Now I know that the #47 bulbs are slightly dimmer than the 44's, but I now read that the 1847 bulbs are a lot dimmer than the #47 bulbs.
Other way around, 47 bulbs are a lot dimmer than 44 and 1847 are only slightly dimmer than the 47.
1847 -- 5 lumens
47 -- 6 lumens
44 -- 11 lumens