Professional labs involved with critical print reproduction would (and do) use profiled and colour-/temperature corrected LED lightboxes/tables. Some cost a few thousand, while others look like they've been in use for decades. And the good old hobbyist make-do of an old shoebox with a single white lamp inside can still be found popping up occasionally at kerbside clean-outs!
For many years I used a tiny A4 sized LED light-table originally intended for art and craft use (Gepe made it I think). It became very blue over time and was disposed of in 2009. The studio light table now is a heavy, red-cancelling (~therefore, images with red/pink appear paler), flat panel LIGHTPAD 940 (
940 lumens — more than enough to light up the entire studio and tan my dial to boot!) made by Art-O-Graph. My brother built an angled wooden table with a rubber top, upon which the light-table sits so I don't have to hover directly above, but assume a comfortable seated viewing position. The light-table is teamed up with a Cabin 8x 6x6 / 6x7 wide-field asph. loupé (plastic loupés are definitely not recommended for critical assessment). It's possible to make your own LED lightbox using LED strips if you have a creative electronic mind.
You can also use an iPad/Android tablet with a lightbox app installed. This is extremely handy for on-the-fly assessment when you're travelling. I use such an app on both my Galaxy tablet and LG phone. Brilliant!