If you read on my website (I've cut and pasted here):

T-1 7152 5V 115mA 11-10980 (#7152 Miniature Bead Grain of Wheat Bulb 5v)
Available at Aircraft Spruce or Memotronics
** Overhead ADIRS and Fire panel operate at half the wattage (0.3 W) and require different bulbs (#680 Minature Bead Grain)

You should *only* use bulb 680 for panels that require half the wattage.