Oh. I misunderstood your problem your asking. Have you done a Google search to see if there's a base conversion device which converts the regular light bulb base to the 12 volt led base? I'm sure someone else has run into the situation and invented some device for this situation.
Honda HRR216VKA Mower
Honda HRS216SDA Mower
Echo SRM-225 String Trimmer
Echo PE-200 Edger
Echo HC-152 Hedge Trimmer
Echo PAS-230 with Articulating hedge trimmer, straight shaft edger, power pruner, and pro torque trimmer
Echo CS-370 Chainsaw
Husqvarna 130-BT Backpack Blower
Stihl Br600 backpack blower
Stihl FS90R Trimmer
Check out my youtube channel for lawn care videos and small engine repair!