With simple supplied Smartthings apps can I use the Cree Connect bulb as a strobe?
How do you define " strobe"?
You can “blink” Hue bulbs through IFTTT very easily. Many people use this for notifications.
Otherwise the Fortrezz Siren has a strobe function that works well.
https://support.smartthings.com/hc/en-us/articles/202294760-FortrezZ-Siren-Strobe-Alarm