I can't do photos, so words will have to do. I bought 3 anglepoise lamps quite cheap. They have a large weighted plastic base, suitable for desk use. The arm of the anglepoise has a stub that just sockets into the base, allowing it to turn. Great for desk use, lousy for the workshop.
I cut some blocks of 2x2, bored a (14mm) hole through the top to fit the lamp spigot. Screw the block to the wall anywhere you want to place a lamp. I've got one block screwed to one pillar drill. The other pillar drill I found a piece of steel tube the correct bore. 4" length of tube, hammered flat leaving 1 1/2 " piece of tube untouched. Drill 2 holes in the flattened part and rivet it to the pulley housing.
I wish I'd thought of the steel tube approach earlier.... a neater solution.
I've picked these lamps up for £4 ish in sales, and they get thrown out by people who realise they aren't students anymore and so need something more expensive.