I'm assuming people know you can set IDL samples WAY higher than the sliders in the D3D dialogue permits. Bounces too.

It's quite possible to use fairly small emitters and ramp up the samples, tinkering with the irradience sample size and bounces to get better results. This comes at an inevitable render-time cost and doesn't always combine well with regular lights.

Can be worth a try though.

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

                                      www.danielroseartnew.weebly.com