De Doming

What is the idea behind this practice ?, how is it best done ?, has anyone who’s done it regretted it ?
Any input very appreciated, I have a few lights I may experiment on depending on people experiences of this, thanks

Search is your friend!

Thanks buddy, I will stop being so lazy and look first in future.
Having looked at the posted beamshots I defo like the domed ones more so won’t be doing this anyway now that I’ve seen the results.

… and the theory behind it.