Re: VU1 ESL bulbs with HA dimmers?

[nobody@xxxxxxxxxxxx (Dave Houston)]

Where did you get "voltage of the electron emitter beam"? Heating the
cathode of the electron gun causes it to emit electrons which are then
focused into a beam, accelerated and guided by other electrodes. The amount
of delection depends on the voltage on the deflection plates. Only an area
the (unchanging) diameter of the very thin beam "lights up" as the beam
traverses the screen. It's the kinetic energy of the beam which causes this
- not an electrical interaction.

     http://electronics.howstuffworks.com/question694.htm
     http://www.scienceclarified.com/Ca-Ch/Cathode-Ray-Tube.html

http://books.google.com/books?id=HCXaRo0vRdsC&pg=PA69&lpg=PA69&dq=electron+gun+deflection&source=bl&ots=m-rky1unrW&sig=nzfCqBZIZf0xGKnWah09MNvnN6M&hl=en&ei=8H-7SrmJKY-Ntgevr4XADQ&sa=X&oi=book_result&ct=result&resnum=6#v=onepage&q=electron%20gun%20deflection&f=false

Electron guns are not limited to CRTs.

     http://www2.slac.stanford.edu/vvc/accelerators/electrongun.html
     http://www.kimballphysics.com/electron_guns/egun_prod.htm

"Joesepi" <JRM@xxxxxxxxxxxx> wrote:

>I doubt voltage of the electron emitter  beam has anything to do with
>deflection but rather the amount of energy to light up the increased area of
>a larger screen in the same amount of time. The voltage on the deflection
>plates may need to be higher to change the angle amount.
>
>I would conclude to get 50, 100 or even 200W of light a fair bit of energy
>would be required and therefore a large voltage, also. What was the enrgy of
>light output from the ole' CRT screen. I always had about 300W, in mind, for
>a larger TV set. but only based on rough hearsay from TV guys.
>
>
>"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
>news:4aba5e35.30488687@xxxxxxxxxxxxxxxx
>> Well, it's been nearly 50 years since I learned about CRTs but, as I dimly
>> recall, higher voltages are required for higher delection of the beam so
>> the
>> bigger the CRT the higher the voltage. Few B&W TVs had large screens so
>> they
>> had lower voltages. Since these folks are not deflecting a beam, the
>> voltage
>> is likely to be much less. And, even if they were deflecting a beam, the
>> "screen" size is much, much smaller than a TV.
>>
>> I asked Vu1 about the internal voltage and whether the bulbs emit x-rays
>> and
>> got the following (non)response.
>>
>> "Detail specifications will be made available after independent and UL lab
>> testing have completed.  Please refer to our website and blog site for
>> current updates."
>>
>> I do not know whether UL will test for x-rays.
>>
>> Ian Shef <invalid@xxxxxxxxxxxxx> wrote:
>>
>>>nobody@xxxxxxxxxxxx (Dave Houston) wrote in
>>>news:4ab843ef.65491421@xxxxxxxxxxxxx:
>>>
>>>> I think that was only for color TVs where the voltage is 32,000 volts.
>>>> Radiation increases with the voltage. It's not likely that these lights
>>>> will have anywhere near that voltage - not if they are going to fit
>>>> existing fixtures.
>>>
>>>The TVs get the same line voltage that these bulbs get.  Also, high
>>>voltage
>>>supplies can be made quite tiny if the current is low and if the
>>>environment
>>>suppresses arcing.
>>>
>>>While I agree that these bulbs are likely to be safe, I think that the
>>>issue
>>>bears scrutiny.  Trust, but verify!
>>
>