Which are the best brand of 2D lamps?

Thorn.

Sadly no longer made so get GE instead

Modern ones Yeah you want GE Wattmisers however do not get them from B&Q!! Much much cheaper on Ebay!

Or you could have a good look through ebay for the old Thorn 2Ds they pop up all the time, or the old GE Starcoat 2Ds and GE Polylux 2Ds. The rest id not entertain not even philips!