I used yaesu bulbs ....only because I order from them alot . And there bulbs are only 89 cent & 25 cents for the nice blue grommet to cover the lamps. Kenwood wants $4 dollar each ......Crooks !!! As for the oddball 28 volt lamps in the 930 ........ Just put the 14 volt ones is series !!! Been doing that for years ....... 73 john