We have a new Desk lamp entity as of 2.05 called Lamp_Desk_Cubic. It uses the improved CubicLight projection method
and has a gorgeous projection image cubemap courtesy of Rich_is_Bored in 2.06.
While it's not appropriate to just override all Desk Lamps in existing missions as a "mod update" there are probably a number
of missions where it would do no harm to replace the single (or few) desk lamp(s) with this new entity.
To my recollection, one such candidate mission would be Xonze's "The Parcel" which has a single Desk Lamp.
Please update here as to whether you would like me to update your mission with this improvement or plan on doing this yourself.