How to Install Light on Ubuntu 18.04 Bionic LTS
Getting Started
4. Testing Light
Finally, to Test Light
From Shell simply with:light -G
In the Output you should see the current Screen’s Enlightenment in percentage value.
5. Light Getting-Started Guide
Getting-Started with Light for Ubuntu GNU/Linux

So Now I’m truly Happy if My Guide could Help you to Quick-Start with Light on Ubuntu 18.04 Bionic!