Maps that use lighting very well.

[baja blast rd.]

Would appreciate some recommendations -- I'm looking for some study material.

[Obsidian]

Anything by Christopher Lutz. Phobos Anomaly Reborn is a good example.

[Cupboard]

dbimpact by Rottking & Ralphis. It's an E1 replacement, large maps. Not a bunch of sidedefs and vertices barfed everywhere. The light changes are sometimes dramatic, it reminds you that not everything has to look realistic to be visually appealing.

[Kappes Buur]

Also, just about anything by Vader or Tormentor.

[scifista42]

I'd say that most of modern polished quality wads use lighting pretty well. Jenesis, Vanguard, Lunatic, BTSX, Valiant, Sunlust, Vela Pax, etc.

[Makazi]

I second Sunlust. It has incredible lighting

[40oz]

Sunlust has so many might gradients, the blockmap bug keeps you from shooting the monsters half the time

[esselfortium]

I might have completely misunderstood how the blockmap works, but I don't think the blockmap bug is related to number of lines of sectors, just the alignment of the 128x128(?) blocks in relation to the map structures.

[scifista42]

The blockmap bug has nothing to do with linedefs or sectors, indeed.