Eiko #47 bulbs are similar to the #44 used for GI, and occasionally lamp matrix applications, on the playfield. The #47 is the same size and voltage as a #44, but use less power. The #47 is a good option for GI bulbs in a heavily-loaded machine, as the lower load will prevent connector burn
We prefer the brightness of #44 bulbs, but #47 is a good option if the machine is on a lot of the time.