Hi Bush rat, welcome to CPF.
I don't own the spot light you are talking about but do own a cheaper lightforce spot light running a 64665 bulb. The lightforce has a plastic body/reflector and plastic lens which means I can only run it for about 30s bursts. I know this because I melted my first one.
I checked the info on the hellfyr spotlight, they claim all metal construction and a glass lens. If you check you're light and it has a proper metal reflector, glass lens and ceramic style bulb holder then I would say go for it.
Start at 1min and build your run time up, keeping a close eye for any sign of heat damage to reflector .
Is the hellfyr light good quality as I might be interested in buying one for myself as an upgrade to my lightforce .