gistfile1.txt

As for the issues, the LEDs are electronically driven by a ballast/driver.
The challenge is in sending a signal to the driver that it can understand
and this manipulate it's load properly. Sometimes the unlatching of a triac
can be misinterpreted as a voltage fluctuation and, if the driver sees 
voltage input changes as an indication to vary the output intensity, the 
driver will change the lamps light level quickly only to go back to the 
normal level as the triac latches again and begins to conduct. This is an 
effect known as shimmering. FETs are more desirable in these instances but 
the real issue is that no two drivers are really the same. Some are 
perfectly ok with triac based, forward phase dimmers.