I couldn't find a source for all the mics being used on Late Night Television... so here's a list.
LATE NIGHT SHOW DESK MICROPHONES (MICS)
JIMMY FALLON
- Audio Technica AT4050 (2009-2014)
- Audio Technica AT4050LE Limited Edition Silver (2014-present)
- AT8430 Stand Clamp
- AT8601 Desk Stand
SETH MEYERS
- SE Electronics SE 4400A (2014-present)
- AT8601 Desk Stand
CONAN O'BRIEN
- Audio Technica AT4050 (1993-2010 @NBC)
- AT8601 Desk Stand
- AKG C414 with custom red grill (2010-present @TBS)
DAVID LETTERMAN
- AKG C414 (1982-1983)
- RCA 77dx (1983-2005)
- Neumann M147 (2005-2015)
JOHNNY CARSON
- RCA 77dx (1962-1970)
- Shure SM33 Ribbon Mic (1970-1981)
- AKG C414 (1981-1993)
JAY LENO
- AKG C414 (1993-1998)
- Shure KSM44A [custom color black] (1998-2003)
- Neumann TLM 170 R (2003-2009)
- NO MIC (2009 Primetime Show)
- Shure KSM313 [custom color gray] (2010-2014)