J
jim beam
Guest
Bill wrote:
> jim beam wrote:
>> Bill wrote:
>>> jim beam wrote:
>>>> Bill wrote:
>>>>> And here is a white at 3.5 volts.
>>>>> http://www.jameco.com/webapp/wcs/st...toreId=10001&catalogId=10001&productId=183231
>>>>>
>>>>>
>>>>> There is also a link to a PDF file to show the wavelengths and
>>>>> chemistry. This manufacturer, whom I have never heard of before,
>>>>> does not use a simple LED to energize a flourescent to get white,
>>>>> as some have suggested, but puts out a spectrum that is heavy on
>>>>> the blue end.
>>>>>
>>>>> I could post more from Jameco, Mouser, Allied, etc....., until
>>>>> people got sick of the subject.
>>>>>
>>>>> Bill Baka
>>>>
>>>>
>>>> but that's the point! the larger the band gap, the larger the
>>>> voltage required! you change chemistry to change the band gap and
>>>> voltage varies accordingly!
>>>
>>> I know that, but part of my point was that the number of chemistries
>>> is growing as people search for real 'white' light, and not the
>>> blueish tint that was shown in the pdf I pointed to, or a super
>>> efficient and bright chemistry that will surpass all previous
>>> attempts. All of the traffic lights in my somewhat backwater town
>>> have gone to single wavelength red, yellow, green that can be seen
>>> even in bright sunlight.
>>> I have only seen one light with one burned out LED in the green and
>>> they don't see fit to replace it since it has been like that for over
>>> 2 years.
>>> Mainstream LEDs emit in one very tight wavelength, kind of the light
>>> version of a radio crystal.
>>> Even I don't want to try to calculate the band gaps that are used all
>>> over the map, like the Jameco part I referred to. That one tries to
>>> be white and the spectrum is not a spike at one wavelength but a wide
>>> blue tapering off on the red end of things. I had to download Chinese
>>> fonts for my Acrobat just to see the whole data sheet, and I only
>>> want to spend so much 'unpaid' time on research.
>>> Pay me and I will make a spreadsheet of every LED ever made and the
>>> band gaps of all the possible materials.
>>
>> so what? doesn't mean a thing if you don't understand what you're
>> looking at!
>
> I found out long ago that you can't learn everything and anyone who
> claims to is either an idiot or lier.
ok...
> I'm an E.E. who just uses the
> parts so I don't need to know all the band gaps.
so how do you design if you don't know theory?
> I do get paid for
> designing circuits that use these parts
ok...
> and I am very money motivated.
that's logically irrelevant!
>>
>>
>>> There are probably only a handful of people who care what makes the
>>> light as long as it works.
>>> I'm one since I have a Cat-Eye 5 LED setup with through hole white
>>> LEDs and I might want to upgrade it if I can find some better white
>>> LEDs.
>>> I was also thinking of building a miniature boost/buck universal
>>> converter to drive the LEDs at whatever brightness I wanted to dial
>>> in with an old fashioned pot. 3.3 volts on the LEDs, 4.8 volts from
>>> my NiMH batteries, and 6 volts from Alkalines. I wouldn't mind
>>> sucking the Alkalines for their last gasp, but the NiMH rechargeables
>>> might not like that very much.
>>
>> irrelevant.
>
> Only if you want to buy new rechargeables every week. Kind of defeats
> the purpose. I haven't seen any bicycle headlights that claimed to have
> an active circuit for maximizing either battery life or brightness or
> even just a level adjust other than a high/low resistor switch.
it's irrelevant to led/incandescence differentiation!
>>
>>
>>> OK, enough electronic stuff.
>>
>> please bill, please.
>>
>>
> How about enough physics stuff from you then?
then stop bullshitting then! then.
> jim beam wrote:
>> Bill wrote:
>>> jim beam wrote:
>>>> Bill wrote:
>>>>> And here is a white at 3.5 volts.
>>>>> http://www.jameco.com/webapp/wcs/st...toreId=10001&catalogId=10001&productId=183231
>>>>>
>>>>>
>>>>> There is also a link to a PDF file to show the wavelengths and
>>>>> chemistry. This manufacturer, whom I have never heard of before,
>>>>> does not use a simple LED to energize a flourescent to get white,
>>>>> as some have suggested, but puts out a spectrum that is heavy on
>>>>> the blue end.
>>>>>
>>>>> I could post more from Jameco, Mouser, Allied, etc....., until
>>>>> people got sick of the subject.
>>>>>
>>>>> Bill Baka
>>>>
>>>>
>>>> but that's the point! the larger the band gap, the larger the
>>>> voltage required! you change chemistry to change the band gap and
>>>> voltage varies accordingly!
>>>
>>> I know that, but part of my point was that the number of chemistries
>>> is growing as people search for real 'white' light, and not the
>>> blueish tint that was shown in the pdf I pointed to, or a super
>>> efficient and bright chemistry that will surpass all previous
>>> attempts. All of the traffic lights in my somewhat backwater town
>>> have gone to single wavelength red, yellow, green that can be seen
>>> even in bright sunlight.
>>> I have only seen one light with one burned out LED in the green and
>>> they don't see fit to replace it since it has been like that for over
>>> 2 years.
>>> Mainstream LEDs emit in one very tight wavelength, kind of the light
>>> version of a radio crystal.
>>> Even I don't want to try to calculate the band gaps that are used all
>>> over the map, like the Jameco part I referred to. That one tries to
>>> be white and the spectrum is not a spike at one wavelength but a wide
>>> blue tapering off on the red end of things. I had to download Chinese
>>> fonts for my Acrobat just to see the whole data sheet, and I only
>>> want to spend so much 'unpaid' time on research.
>>> Pay me and I will make a spreadsheet of every LED ever made and the
>>> band gaps of all the possible materials.
>>
>> so what? doesn't mean a thing if you don't understand what you're
>> looking at!
>
> I found out long ago that you can't learn everything and anyone who
> claims to is either an idiot or lier.
ok...
> I'm an E.E. who just uses the
> parts so I don't need to know all the band gaps.
so how do you design if you don't know theory?
> I do get paid for
> designing circuits that use these parts
ok...
> and I am very money motivated.
that's logically irrelevant!
>>
>>
>>> There are probably only a handful of people who care what makes the
>>> light as long as it works.
>>> I'm one since I have a Cat-Eye 5 LED setup with through hole white
>>> LEDs and I might want to upgrade it if I can find some better white
>>> LEDs.
>>> I was also thinking of building a miniature boost/buck universal
>>> converter to drive the LEDs at whatever brightness I wanted to dial
>>> in with an old fashioned pot. 3.3 volts on the LEDs, 4.8 volts from
>>> my NiMH batteries, and 6 volts from Alkalines. I wouldn't mind
>>> sucking the Alkalines for their last gasp, but the NiMH rechargeables
>>> might not like that very much.
>>
>> irrelevant.
>
> Only if you want to buy new rechargeables every week. Kind of defeats
> the purpose. I haven't seen any bicycle headlights that claimed to have
> an active circuit for maximizing either battery life or brightness or
> even just a level adjust other than a high/low resistor switch.
it's irrelevant to led/incandescence differentiation!
>>
>>
>>> OK, enough electronic stuff.
>>
>> please bill, please.
>>
>>
> How about enough physics stuff from you then?
then stop bullshitting then! then.
