Re: VU1 ESL bulbs with HA dimmers?

["Joesepi" <JRM@xxxxxxxxxxxx>]

Here is what you posted. "higher voltages are required for higher delection
of the beam "

The electron beam is created by a combo of a hot emitter and high voltage
difference between the filament and the phospours on the screen. There are
focusing electrodes and magnetic deflectors in the process of getting the
electron beam to "get there". In a scope, plates are used mainly, but in
TVs, where the Xrays are a problem, magnetic coils (yoke) are used to
deflect the beam.

The voltages required for "deflection of the beam" are not the "high
voltage" problem. As I stated, The "voltage of the electron beam" is the
problem. Perhaps now you should remember... the high voltage that the
flyback transformer creates? Heating the cathode (filament) only makes the
electrons available and not "emit". The high voltage differential applied
across the cathode to screen (beam path) causes them to "emit".

As fas as the "kinetic energy" read the article link you posted. Not the
first one, it's for children. Damn! Busted again!


"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
news:4abb7d7d.17633000@xxxxxxxxxxxxxxxx
> 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!
>>>
>>
>