To set up Lit using the Services feature of Mac OS X:
Go to System Preferences > Keyboard > Keyboard Shortcuts > Services.
Near the bottom of the list, make sure the item called "Show All Menubar Items with Lit" is checked.
Double-click near the right side of the row and type your chosen shortcut; I use Ctrl+Opt+Cmd+L.
Close System Preferences and test the shortcut.
You can also use your own app launcher tool if you prefer.