FortiClient Settings - changing Logging level

We used the FortiClient Configuration Tool 6.0.9 to create a FortiClient deployment and deployed FortiClient to our systems, with the Log Level set to "Debug". We would like to change the Log Level to "Information" instead, but not have to redeploy the FortiClient. Is there a registry key (or similar setting) that we could change instead?

Thanks PS. We don't have EMS (yet)