USB powered ceiling light-bulbs & fans ?

Is it a trend now & where can I buy USB powered ceiling
light bulbs (LEDs) & fans?  Ideally the electrician can design
or make a switch such that it could tap from the main utility
power or the USB batteries (will 19V suffice?)

Any links on where to obtain such items?
sunhuxAsked:
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KimputerCommented:
I don't think it's a trend at all. Why complicate things like power (which travels on plain copper cables) with a design that needs a USB battery, and then the devices AFTER the USB battery are LOW POWERED (not enough for a small room, let alone a whole office. With multiple USB hubs, you now have a complicated structure handling about 2.5Watts per fan/lightbulb, instead of a very simple copper cable mesh with NORMAL lightss and fans.
If you plan on installing 2.5W fans, you're better off not installing them at all.
If you plan on lighting your office with 2.5W bulbs, throw in some infra red head gear for the office workers.
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d-glitchCommented:
There are extensions to the USB standard that allow for operations at higher voltages, currents, and powers.
The max right now is 20V at 5A, which is 100W.

Check out his page, especially the PD Introduction slides.
     http://www.usb.org/developers/powerdelivery/

But I definitely agree with Kimputer.  This is not the way to power simple, stupid peripherals like lights and fans.  There may be advantages to low voltage DC power (safety and solar compatibility for example).  But you can do that without the cost and complications of USB.
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dbruntonCommented:
>>  Ideally the electrician can design or make a switch such that it could tap from the main utility power

Umm.  No.

Utility power is AC, USB power is DC.  You'd require a transformer and rectifier circuit to do this and that costs.

If you require low power lighting then use low power light bulbs such as CFLs http://en.wikipedia.org/wiki/Compact_fluorescent_lamp  These are ideal for continuous use where they are not switched frequently on or off.  Not usuable with dimmers.
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KimputerCommented:
I don't like CFL's at all (takes long time to "warm" up, low light output etc). LED lights are now far better (lower W, more light), and most types now include dimmer compatibility (My whole kitches was bright at normal 400W total bulbs, now with cheap IKEA dimmable LEDs, only 35W total, same brightness)
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dbruntonCommented:
Yeah, but the LED cost is still high compared to CFL.

Wouldn't recommend LEDs this year but give it a couple more and when they start getting price equivalent to CFL.
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KimputerCommented:
If one LED bulb is merely 6 bucks (even 4 bucks non-dim), I don't really mind if CFL is cheaper (is it though?). Actually, the shops agree with me, most of them don't even carry CFL's anymore.
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dbruntonCommented:
Depends where you live.

Where I am incandescents are NZ$2 and CFLs are $5.  LEDs are more and not standard store goods which the first two are.
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Dave BaldwinFixer of ProblemsCommented:
The answer is no, no, and No!  Trying to use the very low powered USB lamps would be one of the most In-efficient ways to light anything.  USB connections are 5VDC/500mA max.
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