As discussed in this thread: http://www.apug.org/forums/forum43/1...9-99-safe.html
The LED in question is this one: http://www.superbrightleds.com/morei...60-degree/440/ It may or may not be suitable for your use in Australia, however.
Anyway, I bought two of these as a result of this tread and tested them, and reported this in the above thread:
"... I re-tested my current setup with multiple 0C filters that had tested "safe" before, and it tested safe again. I then used the same procedure using the pair of new LED bulbs, and they, too tested safe.
"(I probably should have tested just one LED bulb first, but I reasoned that if the pair passed, I wouldn't need to test just one by itself. Turned out to be true.)
"I then combined the new LEDs with my current safelights and tested that, and also got a "safe" test. I was both surprised and pleased. I finally extended the test from 7 minutes (using the Kodak procedure) to 10 minutes and still got a clean, safe test!
"I use the Kodak method http://www.kodak.com/global/en/consu...Safelite.shtml. This is very similar to the Ilford procedure http://www.ilfordphoto.com/aboutus/page.asp?n=148.
"The Kodak test goes to 7 minutes. It was a simple step to add another 3 minute exposure to get a cumulative 10 minutes of safelight exposure. All of this was done with Ilford Multigrade paper.
"Disclaimers: Different papers must be tested for, and each darkroom setup, or change thereto, must be tested.
"Therefore, all this proves is that the specific LEDs mentioned by the OP work in my darkroom with Multigrade. It does not speak to all red LEDs, other types of red bulbs, strings of Christmas tree lights, etc."
Bottom line: (IMHO) none. But see: http://www.apug.org/forums/forum43/1...safelight.html
Originally Posted by Ghostman
I am not against LEDs. I believe LEDs will replace tungsten in the future. But there is certainly nothing wrong with using either light source with a proper AND TESTED filter.