Hyperikon LED bulbs have trouble with mechanical timers so it's best to make sure you use a digital timer. Mechanical timers function on the principal of resistive load; this is a device that absorbs energy in the circuit through resistance generating heat through motion. Resistive load bulbs like incandescent or CFL bulbs have a higher current running through them than the low current nature of LEDs. So if try to use an analog timer, your Hyperikon LEDs may turn on but when the timer tries to turn them off, it wont detect the Hyperikon LEDs. The result is a timer in "off position" but your Hyperikon LED bulbs are still "on". Because of all this, it is best to use digital timers when trying to control your Hyperikon LEDs.