Is it possible to convert an HID Source Four or Source Four Jr fixture into a standard Incandescent fixture?
Yes, is it possible fro 120v HID fixtures. Simply remove the HID ballast and end cap (P/N: 7060A2071-0X) from the fixture and add a standard Incandescent end cap (P/N: 7060A2008) to the back of the fixture. The rest of the fixture is identical.
What about LED conversion?
For the Source Four HID 120v you can remove the back cap and ballast and install a S4WRD LED retrofit cap to convert to LED. Unfortunately, these end caps do not fit onto Source Four Jr fixture bodies.