[TowerTalk] Fwd: Now THIS is a tower climb!

[Jim Lux]

On 1/13/15 7:09 PM, Herbert Schoenbohm wrote:
> I once visited a BC station in Trinidad that had the red "on the air"
> light inside a double panel of glass between the studio and control
> room.  I foolishly asked "do you mean you have to remove one of those
> glass panels when you have to replace a burned out lamp?" The answer was
> "no...we never have to replace them since they are 240 VAC bulbs and we
> power them with 120 volts."  I guess it cuts back on the illumination
> but extends the life of the bulbs significantly.
>

life goes as something like the 12th power of the voltage. Running 130V 
bulbs (a standard voltage) on 110-120V makes them last virtually 
forever. Used in, e.g., railroad signal lights.  (well, (130/120)^12 = 
2.6, so 2600 hours instead of the nominal 1000 hrs)

Wikipedia says 16th power..


>
> Herb Schoenbohm, KV4FZ
> On 1/13/2015 6:15 PM, Roger (K8RI) on TT wrote:
>> Now, invent a really long life bulb and you will sell at least a
>> hundred !!
>
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