HFguy wrote:
David wrote:
Any bulb will burn for decades if the voltage is low enough.

Also the fact that it's been on continuously. Incandescent light bulbs
seldom burn out while they are on, unless dropped or hit. Failures are
caused by the current surge when it's turned on. ...

Every car failed around 200,000 miles. But only failed when it was
started. Therefore starting is the only reason why cars fail. HFguy
uses same logic to 'prove' power cycling damages incandescent bulbs.
He hopes you will believe sound byte reasoning rather than read many
paragraphs of reality.

As taught in Junior High School science, first we learn underlying
principles before we can obtain a fact. Observation alone even proved
spontaneous reproduction.

There is no major shock to incandescent bulbs during power on. As
well documented in so many light bulb industry publications, light
bulbs are damaged by hours of operation - and as David so accurately
noted - excessive voltage. Unlike HFguy, the industry even provides
numbers for what causes light bulb failure. HFguy provides no numbers
because he is promoting subjective speculation as facts.

For example, a voltage increase causes a decrease in bulb life
expectancy exponentially to a power of 13. Raising the 120 volts to
127 volts will cause a light bulb to fail twice as fast. These are
industry numbers found in the same publications that list what causes
light bulb failure. Power cycling is not listed in what causes
incandescent bulb failure - in publications that use science rather
than personal speculation.

Once a light bulb filament is severely damaged (by hours of operation
or excessive voltage), then even a so gentle power on may cause
filament failure. Look at any light bulb that failed during power on.
Before it failed - whether during power on or in constant operation -
black residue from the filament is already apparent inside the glass.
The filament is down to its last ten hour - like the car with over
200,000 miles. Hours of operation cause a filament to vaporize; those
black deposits.

HFguy makes claims by violating what was taught back in Junior High
school. Without first learning underlying principles of how a light
bulb fails, instead, he has proclaimed based only upon observation and
wild speculation. He ignores junior high school science to promote
speculation as if it were fact. Such reasoning also proved Saddam had
weapons of mass destruction.

Incandescent bulb life expectancy is determined by hours of operation
and electrical voltage. Exponentially increase light bulb life
expectancy by minor voltage reductions.

If HFguy is so confident of his proclaimations, then he can cite an
incandescent light bulb manufacturer publication. He cannot. He
speculations are classic junk science - not found where reality is
published.