We have a wallpack that has two (2) 6-12 volt DC base lamps that are used for egress lighting, used to come in HPS/MH for reg ltg. The egress was from a remote em battery pack.
Currently, I see a lot of CFL wallpacks with this option.
As to MH/HID hi-bay type, the quartz restrike option is available; I have not seen anything with Em Ltg built-in. It may exist, but I have not seen it.
AS the OP didn't state the use he is looking for.....I'm just throwing this out.
