Light off/on values

The other day I read a thread that explained how to set light values to a previous state after a differ dim value had been applied but I can?t find the thread anywhere. Might someone please be able to post think link to the thread if they know it.

The service urn:upnp-org:serviceId:Dimming1 has a variable named LoadLevelLast. Whenever a dimmer is sets its dimmed value (LoadLevelStatus) this value is also stored in LoadLevelLast.