Re: VU1 ESL bulbs with HA dimmers?

[Charles Sullivan <cwsulliv@xxxxxxxxxxxx>]

Hold on there...  The horizontal and vertical deflection of the electron
beam in a TV CRT is normally accomplished magnetically with steering
coils.
  http://electronics.howstuffworks.com/tv5.htm

On Thu, 24 Sep 2009 14:36:27 +0000, Dave Houston wrote:

> 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!
>>>
>>>