I deal with electrical and HVAC work too. Usually, I carry my HDS U60 with me. Instead of holding it, you could leave it tailstanding to light up the panel. I find the U60 more useful for inspecting ducts and coils and if needed, there's always a brighter mode instead of the primary setting. The primary setting is good enough for most close up work/inspection
As for polymer type lights, I have a Pelican PM6 3320 as well. It's too bright for close up work but at least you will have peace of mind that your light is not electrically conductive.
A headlamp would be best but I haven't got myself any yet. I'll be readhing thro to look out for any recomendations by fellow CPFers