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Re: lights



Thomas Barr <tcbiii at earthlink_net> wrote:

<snip>
>I still haven't changed any of my PC bulbs either. I got 4 years on a pair.
>I'll be damn if I change those 20-40$ ea bulbs till they die completely.
<snip>
Absolutely right. PC bulbs AND T8 bulbs are designed to keep their (design)
lumen output constant for their entire life. Changing them before they die is 
a plain waste. T12's are a different matter. It's not a problem with the
phosphors afaik but an effect related to the ageing electrodes. Triton T12
bulbs use a proprietary technology that protects the electrodes from premature
wear thus they seem to be able to keep a more even lumen output along their 
life. I believe a similar technique is used in VHO bulbs. Even with that
electrode protection in place, though, they tend to loose their lumen output 
a lot faster than any other fluorescent bulb type. It's outdated technology 
anyway.

- Ivo Busko
  Baltimore, MD