Sorry, but just buying a lamp is generally not sufficient- espacially for a major project.
High pressure liquid systems generally have the lamp encased in a silicon glass tube, which, or a number of which, are placed in a polished SS (high internal reflectivity) vessel.
Low pressure systems...
SFTB, if I was to address either of the approximation you'd asked, I'd just go back to first principals to make the first pass estimate. The physical shape of the media and density of wire weave is so variable, that providing any answer here is pointless.
If it is important to be more...
