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Re: Halo Blue?
Dear Tom,
Halo blue is a fluorescent powder made of calcium fluorophosphate activated with
antimony.
It's exitation peak is at 220 nm, (so quite good for the production of a low
pressure mercury discharge lamp) and it's emission peak is at a wavelength of
482 nm. The band width at 50% of it's relative energy is 138 nm and the band
width at 25 % is over 200 nm namely from 400 till over 600 nm. The colour
impression is therefore very lightblue (because of it's very width waveband) and
quite pale (faded or washy, I don't know the right translation). As it is a halo
phosphate the powder is not very stable and the colour output will be lighter
and lighter over the years. I think you can compare it with the colour that you
call light blue, but now you also can compare it with other powders who have
corresdonding wavelenght. It's a very soft blue with an emission line to the
green and even to the yellow (10%) part of the spectrum. I have the powder here
in stock, (Rotterdam) but I don't think you can handle our European method to do
the powdering yourself. If you need an ounce I can ship it to you through TL INC
but I think that shipment is much more costly than the powder itself. The powder
cost dFl: 76,-- (about $46.--) a quarter of a European kilo.
Best from dirk a. boonstra