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> Using LED lights in your enlarger |
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#21
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I have only tried the 2 Dial bulbs, one cold tone and the other, which is the 2700 warm, and I found that with the cold tone, and I can't remember the kelvin rating of it, that I could not get a full range of grades with it, the bulb I use, which gives about 100 watt equvilent to a photocresnta type, is rated at 14.5 watt, and judgeing by eye, not very professiional, but ny looks the light it gives is very much the same quality I get from a 150 watt photocresnta bulb, whatever, it works fine and I am not going to try any further, I am getting good prints from it, nit very scientific, but practical, I think your electronic timer muxt have a fault as when I tried out a basic electronic Paterson electronic timer before sending it out it worked perfectly as it does with my RH designs Analyder/pro
Richard
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jerseyinblackandwhite.blogspot.com |
#22
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Sounds good. Beautifully engineered I bet; my Leitz Valoy 11 is. Shame you can't use under the lens filters. I'm not familiar with your enlarger but wonder if you can't make a wooden container for under the lens filters and somehow attach it to the underside of the enlarger head. I once did this for a friend who had the same problem as you with a 5x4 De Vere. Alan |
#23
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If the filter thread is accessible on the enlarging lens there was a suggestion on here a while ago about using a Cokin A filter holder with the Ilford filter holder glued to it.
See post 6 on this thread for some images http://www.film-and-darkroom-user.or...r+holder+cokin Bill |
#24
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[QUOTE=Richard Gould;, I think your electronic timer muxt have a fault as when I tried out a basic electronic Paterson electronic timer before sending it out it worked perfectly as it does with my RH designs Analyder/pro
Richard[/QUOTE] It also could have something to do with the fact it is a dimmable LED which do not take kindly to non standard fitting for which it was not intended. The best point about the LED bulb is it runs so cool, if I use it in the Opemus with the non digital readout timer, I can dispense with the glass in the carrier and that is 4 less surfaces to attract dust. Now if I could find a LED to fit my LPL7700...…. |
#25
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#26
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Richard
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jerseyinblackandwhite.blogspot.com |
#27
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Last week I build a LED lightsource for my beseler 45.
I removed the cold light source and placed a plate with cree RGBW powerleds. Yesterday evening I tested it with the split grade principal soo green for highlights and blue for the dark areas. I have to get used this work this way, but first results look very pleasing. Also quit short exposure times. I got inspired by this link http://www.trippingthroughthedark.co...ment/led-head/ Last edited by Hansm; 13th March 2019 at 06:45 PM. |
#28
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Okay, I meant to report earlier...
I finally managed to get another LED bulb from B+Q, when they restocked. This being the second bulb I have bought, having previously bought a 'warm tone' one, as people on this forum said that they had good results with it, but also because 'daylight' bulbs were out of stock, which I also wanted to buy to compare. The second bulb I bought now is rated at 4000k and rated as 'daylight'. I have only managed to do the quickest of tests with this new bulb so far, but on grade 3 at least, it gives the same tones as using my current filament bulb AND the brightness seems to be slightly higher, so presumably that will mean shorter exposure times overall. I intend doing a grade for grade test across the filters when I have more time. The only thing I worry about still (although only slightly), is the wording that I have mentioned previously in the first post here, in which the wording on the packets say that, 'the light will give out 60% of its full power in less than one second'. I do wonder how this might affect test strips times compared to the actual print exposure? I wonder as there might be a small, but important difference in total exposure time = read my first post on this post to see where I'm coming from. I will of course report back in due course. Terry S |
#29
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I noticed when I switch off the lights in my livingroom that there is a very dim greenish afterglow with the led bulbs. After some seconds it disappears.
Maybe something to check as well? |
#30
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Quote:
Richard
__________________
jerseyinblackandwhite.blogspot.com |
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