halogen is basically the same as tungsten, and would give you a very warm
yellow orange color cast.

however, the juxtabosition of the two can be interesting.

shoot vertically, aim your flash to bounce off a sidewall.  Use the halogens
for background and hair light.  You'll need a tripod for this.

set your f/stop for as minimal as you can, shoot wide open if needed, and
you'll need a very slow shutter speed, 1/15th would be lucky, you could end
up 1/8th 1/4th.  If you have a hand held meter, you want to get the
background to be one stop under what your subject exposure will be.

keep in mind, 100 watt seconds, a rating of a flash power, is the equivelent
to a 100 watt incandescent bulb for one full second.  So do the math to get
a decent exposure at 1/15th, that's four stops and each stop doubles the
required out put, 2, 4, 8, 16 100 watt bulbs.

If you filter for it and/or use tungsten film, it's not much of a
problem.  Color casts can also be corrected after principal photography
in Photoshop, but that's an inferior solution to filtering or otherwise
compensating at the time of exposure.

Halogen lamps have a higher color temperature than ordinary light bulbs,
since their filament temperatures are higher.  But they are still quite
orangish-red compared to daylight.

Flash units typically produce daylight color temps until you put filters
over them.  Mixing them unfiltered with halogen light will make proper
balance impossible, although the effects may or may not be acceptable.

Not a problem in daylight, as flash units are already balanced for that.

Color temp of the usual halogen 120V non-photo lamps is about
2800-2900K.  Visit any of the websites of the leading lamp suppliers
for details.