lights

I think my 400 watt hps bulb is old and I really don't have the $ to replace at this time - I do, howver, have a brand new stealth hydro SL85/30K dual spectrum II flowering cfl bulb (350 watt equivalent) and ballast - will it be ok to use this until i can buy a new hps bulb? my flowering space is only 2' x 4' and it's lined with mylar - mahalo