[time-nuts] White LED's

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jan 30 20:14:37 UTC 2010


Chuck Harris wrote:
> I bought some of the LED replacements for Edison bulb incandescents, and
> they have an afterglow that lasts for several minutes.  It is very much
> dimmer than when they are turned on, but is there none the less.
>
> -Chuck
>
> Bruce Griffiths wrote:
>> The speed isn't  terribly surprising since the "phosphor" used  is 
>> actually a scintillator.
>> Unlike phosphors scintillators don't have long decay times so there 
>> is no afterglow like that from a phosphor.
>>
>> The IKEA LED lamp output may not be significantly modulated if the 
>> wall wart constant current supply may have an output thats a little 
>> smoother than just rectified AC.
>>
>> Bruce
>
Some white LEDs use phosphors, others use scintillators it varies from 
manufacturer to manufacturer and part no to part no.

Bruce




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