Dear Vanessa,
Sorry to inform you that the lamps are different from one aligned to the
other and there are models with lamps from 200-350W.
The manual doesn't include info about the lamp power supply.
to fugure the optical density you sholud use a calibrated meter or you
can try to compare photospeed with that of a known exposure system.

most of the optical paths of the lamp houses iv'e seen are very simple.
just open and look inside.

good luck

Shay Kaplan