Woodcraft has a closeout on their MT2 hollow lathe center that’s now on sale for $7.99. Though it’s largely a specialty tool, there really isn’t a better way to hollow out a lamp core faster than this.
This is for boring deep holes in lamp components; the center has a hole through it that, assuming your tailstock ram is similarly hollow, allows a boring gouge to be inserted through. The gouge bores out the long hole as found in most lamp uprights while still supporting the revolving workpiece — an interesting way around the problem of boring a deep hole.
3/8″ ID, #2 MT, Hollow Center [woodcraft.com]