In article ,
"Bob Daun" wrote:

I currently am working on a few cherry bowls. I know that cherry will
darken upon exposure to sunlight from a maple type color to a darker reddish
color. I know this is primarily from exposure to UV light.

Well, there's that big light in the sky outside - cheap, too. Put them
out in the sun for a while.

Halogen won't do much for you. And most lights that would do much are
shielded to reduce shortwave UV so they won't hurt people. Skin cancer
and itchy eyes both hurt.

You could get a germicidal UV lamp (florescent, usually - seen in things
like water filters and cabinets to store safety glasses). Some metal
halide or mercury vapor lamps sold in the aquarium trade lack the usual
UV shield layer since some UV is good for mimicking sunlight.

A good old fashioned carbon arc light is a wonderful UV source, but not
one that's all that easy to find these days. If you happen to have an
arc welder and a twin carbon arc torch, that would be the ticket to
rapid results - but wear your helmet and leathers, and don't catch the
wood on fire.

I suppose tanning lamps would likewise work, and you could get a lot of
bowls on a tanning bed if you found a tanning store going out of
business.

With any of the lights, you should arrange the lights and bowl to be in
a box or cabinet that keeps the light off your skin and eyes, and use
safety glasses and gloves/long sleeves if you are rearranging bowls with
the lights on. A better box/cabinet design would have a switch that
turned them off if the door was unlatched, and shiny reflective insides
so you got maximum use from the light.

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