LED GREEN: Pale Green diffused 5 mm half-round lens, 24 mcd at 20 milliamps over 24 degree half power angle, 48 degree viewing angle. Half-round means shaped roughly like a popsicle. Forward voltage 2.1-2.8 volts, wavelength 567 nm, spectral line half width 30 nm. This page lets you order 200 for $2.99. Click here to order 20 for 60 cents.
Also consider these similar low-profile LEDs:
Red Version 1 Red Version 2 Amber
We also have ultra-bright LEDs:
Amber 16000 mcd Amber 3000 mcd Red 1000 mcd Red 500 mcd