> Has anyone made the switch to LED bulbs at home or office?

LED costs are still falling nicely. BUT the efficiency of LED lamps is 
still only comparable to the best of other technologies whose initial 
capital costs is cheaper. Halogen can be very competitive. The bulb 
life is << LED but bulb cost is < LED.

CFL bulbs, which are fluorescents in a different form factor, 
generate their own high frequency so are  buzz free. You can now buy 
100+ Watt CFL bulbs - about 500 Watt incandescent equivalent. 
Marvellously bright. I have a number :-).

Fluorescent tube format can use HF electronic ballasts for silent 
operation. Given the distortions of the invisible hand it may be 
cheaper to buy CFL bulbs of suitable size and use their electronics to 
power tube fluorescents, depending on how many you have to do and how 
you value your labour.

LEDs are essentially DC and can be PWMd at above audible frequencies 
with ease.

Dimming:    LEDs are easily dimmable (but it should be done with PWM 
applied to the LED and not smoothed DC) whereas CFL are usually not 
(as their internal controllers are simple and not intended to be 
accessible) and fluorescent controllers need to be dimmer rated.



        Russell


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