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#31
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The colour temp of bulbs used in colour enlargers is around 4000K so the bulb suggested by Edmund should be fine. even one with a higher temp will work, all you will have to do is introduce more yellow to balance out the blue. Apart from anything else, the current consumption of the LED is far less than a normal tungsten bulb so really it is almost a win-win situation.
The down side of the LED bulbs is thought to be the number of on-off switching largely governs the life of the bulb, this can be far less, it is all depending on largely the quality of manufacture. Whilst this figure will in all probability number in the many thousands, it may prove the need to have at least one spare to hand. |
#32
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Quote:
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#33
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Quote:
It still gives me short enough exposure times for B&W. Mike |
#34
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The last I heard was that there was now a 50W equivalent, which is a bulb widely used for shop window displays.
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#35
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https://metro.co.uk/2019/05/16/led-l...sleep-9561475/
All this talk of LED lights prompted me to post this warning article that I found whilst looking for a spare bulb for M605 today. I wonder if looking at an LED lamp through a magnifying focus finder would pose a hazard to ones sight. I see AG photographic have the A1/231 that I am looking for. Cheers all. |
#36
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We are all doomed!!
Interesting article. Thanks for posting. Mike |
#37
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My optometrist advised me a couple of years ago that, as I had very early signs of cataract that don't currently affect my eyesight, I ought to protect my eyes from UV light. So I wear prescription driving glasses whenever the sky is at all blue and, if not driving, good quality sunglasses with UV protection. I wonder whether that's what that French report was actually about (given that the journalist was probably reporting beyond their immediate competence).
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#38
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"It's light Jim, but not as we know it."
To boldly go where no darkroom printer has gone before...
__________________
MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#39
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it's a newspaper reading a press release from a scientific organisation and, as always, wholly failing to understand a word of it. Also as always, deliberately concentrating on the doom and gloom in order to increase their circulation.
High intensity visible light is known to cause damage in susceptible people. Visible light is often called "blue light" to distinguish it from ultraviolet and infrared light so it is possible the original article was using this term for all visible light. Saying that, blue light is more prone to cause a problem as it has higher energy - the reason why UV is particularly dangerous as Michael has been warned about. White LEDs are usually made from blue or UV LEDs that excite a phosphor coated on the LED to give the white light - hence you may want to avoid looking at white LEDs directly through a magnifier, but I don't know how much of the UV (if any) gets through the phosphor (manufacturer's datasheets will show this if it worries anyone) and by the time it has been through your enlarger to spread the beam, and given the small area of the focus finder, the final light intensity is barely enough to focus the negative so I don't see an issue there. Just another "we are doomed I tell ye! Dooooommmed!" newspaper nonsense. Last edited by Bob; 2nd February 2020 at 10:29 PM. |
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