The distance depends on your wattage. I use a 40 watt, but you can use a 20
60 or more. So, the more watts the more heat I suppose. I built a
cardboard "box"--actually the first one I built was round to fit over the
shade of the light source I had. I cut a piece of cardboard box long enough
to go around the light and about 5 inches wide, rolled it into a tube, taped
the end over the lamp shade, made a front piece to hold the filter and taped
that to the front end of the cardboard. When I used it, after an hour,
which is the usual tonation time, I found that the filter was warped. So I
took a knife and cut little backwards opening flaps in the cardboard. That
way the white light from the bulb shown out backwards and not frontward
towards my body, and the flaps let enough heat escape that I never had to
worry about warping filters again. But finally, the plastic shade came
loose one night while my husband was tonating and fell against the bulb. He
was sleeping and didn't notice the horrid melting plastic smell, but I sure
did! So I threw that set away and bought a metal shade clamp on light from
the hardware store. Thinking to make a better box I bought foam board at
the hobby shop and cut and made a nice, pretty box that I glued to the lip
of the metal shade and I made it 6 inches long so that I wouldn't have to
cut a lot of flaps in it. All nice and fancy, all pretty. And WAY too top
heavy!!! When I clamp the light now, it just is so top heavy that it hangs
straight down and almost pulls the clamp off the floor lamp I have it on.
So--I will go back to cardboard boxes and make a new filter holder.

The Let There Be Light book actually has plans in it for making a holder
though. What sizes to cut, etc. I just guestamated both times and the
holders themselves are fine--it's just that the foam board is too heavy.

Samala
Renee

-------Original Message-------

How far away does it need to be from the filters? How do you
Accomplish this?
Appreciate any info.