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Power consumption is not studied much in monitors. I found a couple of recent reviews:
http://www.tomshardware.com/reviews/lcd-backlight-led-cfl,2683.html
http://www.silentpcreview.com/Samsung_Lenovo_monitors
Seems like even on the ones advertised as low-power, you only get below 15W if you have the brightness turned down - but you would do that anyway.
Why the 15W limit? Is that arbitrary, or do you have it in some unusual place? If it's outdoors or in a boat or car or something, you may need to look up "marine LCDs".
Here is where LED back light technology actually gives some practical advantages. Lower consumption, and lower idle. Also if this is really for environmental concerns, they are supposedly cleaner to manufacturer and dispose of then CCFLs. But keep in mind modern LCDs aren't exactly power hogs in the first place. I mean here we have a CCFL IPS (traditionally thought as a relatively power hungry pairing) in comparison to a LED TN (what one would think is the most efficient), both are much larger then your requirements at 23 inches -