I purchased this bulb from superbright LEDs:
I use it in a small aluminum utility housing pointed at the ceiling in a small bathroom I use as a darkroom. I have tested it with VC papers and with xray film and found that it does not fog either in 5 minutes.
I used a red LED from Radio Shack to make a darkroom flashlight
the LED's emission was right in the middle of the part of the spectrum you'd want for a safelight...I forget the wavelength...but it was printed on the package & I called Kodak's 1-800-242-2424 tech support to check
ANYWAY...I wanted to pass on how I made the flashlight since it was so simple:
get a red "jumbo" LED from Radio Shack ( the BIG one ), a plastic film container, some aluminum foil, and 2 AA batteries
fold over a couple layers of the foil and put that in the bottom of the plastic film container
poke 2 holes in the top of the film container & slip the leads for the LED through the holes and bend them over so the LED won't fall out
put 2 AA batteries in the film container...one + side up, the other + side down
when you put the top back onto the film container ( if you line everything up carefully ) VOILA the LED is on and works great as a red darkroom flashlight....to turn it off you only need to pull one side of the top up -- you don't need to completely remove it.
I made one out of desperation when I was temporarily without a normal safelight....I never need to use it anymore, but I always loved it since it was so simple and worked pretty well
I just got my order of these from Superbright...
Product: E27-x8-G LED bulb $ 3.95 (each)
They work great. No fogging from 3 feet (1 meter) during paper processing. Nice and bright. about twice as bright as the christmas tree red lights I was using.
I am using two of the Optiled Red lamps in my darkroom with VC papers and have had no problem.
FWIW, SuperBrightLEDs sells LED flashlights of various descriptions, as well as LED flashlight bulbs for use in "generic" flashlights. I've got a little red LED keychain flashlight. It's handy for shining light on the enlarger lens's f-stop scale or finding bits of dropped paper. I also take it out with me when I take photos at night, since it's so small.
Originally Posted by DarkroomExperimente
It's easy, the cheapest red LED deco light f.e. for clamp lamps will do the job with every kind of bw paper. Anything else than red must be tested seperately with every kind of paper you use, no matter how cheap or expensive you lamp was. Red is always safe, but orange that I mostly use is more conveniant. Yellow is mostly unsafe. There is absolutely no need to buy expensive safe lights for bw nowadays. The old safe lights with light bulbs and filters are a deal worse.
Best - Reinhold
Originally Posted by grommi
Most, if not all, red LEDs also emit small slivers of blue and/or green light. You can't see them with the naked eye as they are overwhelmed by the safe red light. But if you go into a completely dark room and carefully observe the red light as reflected from the business side of a common CD, you might be surprised. The CD acts as an inexpensive prism, breaking the light up into its separate wavelengths.
Because the slivers are small, if your normal working procedures only expose the paper to the safe light for a short period of time, you might be all right. But if, like me, you often find yourself in a complex and lengthy dodging and burning session, you might begin to experience subtle fogging. I did using 635nm red LEDs.
The solution is to filter the red LEDs with a single layer of Rubylith.
I made fogging tests with several common red LED sources and up to 10 minutes I got absolutely no fogging at all, I made it properly with pre-exposed paper. Even a cheap bicycle tail light was perfect, assuming you don't aim with the light directly on the paper from a few centimeters distance. Besides that the corner with the enlarger should always be blocked from direct light beams, no matter which source you use.
Jobo used to make an LED safelight that looked Amber and they claimed itwould even be safe with Colour Ppaer, (but that was in the days of EP-2 Colour Ppaer) they called it JOBO Minilux if anyone whats to go searching.
I used red LED brake lights driven by a 12V supply, and red LED Christmas lights with no ill effects. These were great for lighting areas of the darkroom where the main safelight didn't quite reach. The standard test is to put out a piece of enlarging paper with something on it for five minutes. If there is no shadow then the light is safe.