I am sure the Lightspeed appliance has Radius accounting. It can be used as a Raduis server. In my AAA profile I can set Lightspeed as the radius server and it seems to work.
RADIUS Server "LightSpeed"
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Parameter Value
--------- -----
Host 10.175.4.131
Key ********
Auth Port 1812
Acct Port 1813
Retransmits 3
Timeout 15 sec
NAS ID N/A
NAS IP N/A
Enable IPv6 Disabled
NAS IPv6 N/A
Source Interface N/A
Use MD5 Disabled
Use IP address for calling station ID Disabled
Mode Enabled
Lowercase MAC addresses Disabled
MAC address delimiter none
Service-type of FRAMED-USER Disabled