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Thomas Barr <tcbiii at earthlink_net> wrote:
>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.
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 It's outdated technology
- Ivo Busko