The best light set?
None.

For outside renders in Poser 8 and IDL render settings, use bb's free Env dome or sphere and ONE single infinite light at reduced settings.

There is only one sun out there.

For inside renders?
Take a look in your own room and reproduce.

Never-ever use a pré build light set.
Most if not all are total gar**** and ONLY work in the Poser version, and in the particular scene  they where made for.

Since IDL started with Poser8, all older light sets are for the trash can.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!