If it is like on my rig with illuminated "strands"; I'm not sure it has a bulb. I think it has a starter somewhat like a neon light, makes me assume you need to replace the entire lighted portion of the handle.
2016 Ford F350 Turbo Diesel SRW 4x4 2017 Grand Design Reflection 297RSTS 2013 Ford F350 Turbo Diesel SRW 4x4 (Destroyed by fire - 8/29/16) 2014 Grand Design Reflection 337RLS (Destroyed by fire - 8/29/16)