mfr laser drill with yellow focus. it will pay the big reactor yelloirum used to power the laser drill and add sulfur and glowstone ?
I have built one of those with 4 -5 focus to get yellorium, I don't run it though as I have not commissioned my turbine (and I was concered that the power used would be excessive, so I built a deep dark miner with 64 mining wells instead) , I am waiting to see if the problems with the computer code that I ran into are fixed by Dire, I do have a diamond chest of yellorium and the deep dark provides just about all the minerals I could never use. It is really a little frustrating that I have plenty of redstone, ender pearls, can get as many blaze rods as I need, I am nearing 1000 diamonds even though I used diamond blocks in my reactor, I mined the nether and have plenty of nether quartz but glowstone is hard to come by (what I really mean is I have to go out to get it rather than build something to bring it to me in vast quantities).
I did do a MFR witch spawner and that only produced about a stack of glowstone in a full MC day with wand of equal exchange I will probably get 8 - 10 stacks in that time.