A photography meter is probably reading in LUX. If so...
One answer is that "no" you can't convert from LUX to PAR with a standard conversion.
Another is that "yes" you can convert as long as you know the same bulb's PAR index. (I.e. someone else has taken both a PAR and LUX reading of the same bulb you are using and created a conversion factor from these measurements.)
There's a wide variety of "color profiles" in bulbs, and this can have a big impact on the actual PAR you calculate. Having said that, if you know for a fact that one of the index bulbs has a similar color profile to your bulb, then you can still get some idea of your PAR from the calculation.
If you search, I think Advanced Aquarist has some index values listed somewhere.
I'm using a LUX meter as well...I think it you're aware of how it works and the limits involved you can make due pretty well without worring about PAR. (OTOH, if you can borrow a PAR meter though...)