what about halides or halogens?

what about this one?


Philips
Ceramaluxâ?˘ 250 Watt Clear High Pressure Sodium Bulb
Model C250S50/ALTO


This bulb has mogul base, 28500 lumens, 24000 life hour, 9-3/4 in. overall length, 2-1/4 in. dia., ED-18 shape, 21 CRI, 2100 K CCT. Mfg #C250S50/ALTO.

â?˘ Mogul base.
â?˘ 24000 life hour
â?˘ Ceramaluxâ?˘ 250 Watt Clear High Pressure Sodium Bulb
â?˘ 28500 lumens


and reflector screens.. why can't i just use a mirror?