There are several different 60mm Illum rounds for the M224 Mortar.
This is the first one I found:
http://www.usna.edu/USMCInfo/Documents/Pubs/b2117.pdf
M721 illumination
Weight 3.75 lbs
Length 16.85 in
Maximum range 3200 meters (at burst)
Burn time 40 seconds
Candlepower 350,000
Color White w/black markings
This one covers the M83 round as well:
http://www.lejeune.usmc.mil/soi/itb/...Ammunition.doc
(3) Illumination (ILLUM). Used in night missions requiring illumination for assistance in observation. Illumination may also be used to mark targets or to signal friendly forces.
(a) M83 Series Cartridge (Figure 7.)
1. Type/use: Illumination/battlefield illum, and marking targets.
2. Identification: White w/ black markings
3. Components: Fuze-Time, M65 Series Propelling charge-M182
4. Max. Range: 931 Meters
5. Limitations: Cartridge cannot be fired below charge 2.
6. Remarks: Cartridge contains an illuminating candle/parachute assembly. Candles provide about 250,000 candlepower illumination for at least 30 seconds.
(b) M721 Cartridge (Figure 8.)
1. Type/use: Illumination/ battlefield illum, and marking targets.
2. Identification: White w/ black markings
3. Components: Fuze-Mechanical Time Super quick (MTSQ): M776 Propelling charge: M204.
4. Max. Range: 3490 Meters
5. Limitations: Cartridge cannot be fired below charge 2.
6. Remarks: Cartridge provides about 325,000 candlepower illumination for at least 40 seconds.
Hope this helps.
TR