> >> >> Weeks ago  I left  my UV erasable chips under the sun for hours and I di
d
> >> >>not notice any change (even using the magnifier glass someone
> >> >>suggested)until they flew away from  my home balcony in 7th floor,just
> >> >>because of the wind.

I'd like to mention that it is possible that high efficiency desk PL lamps
make enough UV to erase an EPROM, when the lamps are new.

I wer glasses that go dark in the sun, this is based on a near UV
sensitive reversible chemical reaction afaik, and when left under such a
new PL lamp they went dark about 1/2 the way. Under an UV eraser they go
VERY dark VERY fast.

Thus, next time, tape an EPROM to your desk lamp bulb (must be PL and new)
and leave it there for a week or so, and maybe...

BTW taping the chip near the end of the lamp where the phosphor ends may
help imho, as there is often a band of clear glass between the socket and
where the phospho starts. If you look into it with a dentist's mirror, you
should be able to see a bright blue glow inside the lamp (so don't look
inside).

Peter