My preference would be with LED since they are either on or off. I like CFLs because of their low power consumption but I don't care for the gas inside of them. Also, CFLs in my mind, don't like cold temps and don't like on/off cycling. LEDs on the other hand, are more tolerant of either.
In regards to dimming LEDs, I was under the impression that an electronic dimmer was to be used with them rather than a resistive dimmer. To expand: the electronics would be PWM which would dictate the length and duration of on, and of off, times. Lesser "on" times would result in less "total" light output even though the LED is on 100% during the "on" times.
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TomS
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