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> LPL 6700 enlarger query |
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#21
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Hi
Silly question, but is it possible that the transformer is damaged and not giving out 12v ? forgive my stupidity if this is not possible. Steve |
#22
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Quote:
The lamp I recommended is not sold locally where I live in the UK but there are many other similar fitting 12v 100w 'projector/domestic use' lamps for sale at a fraction the cost of the Osram. I am guessing that the odds are that OP picked up one of these - in which case problems await. There may be other manufacturers of suitable lamps (I haven't found one) but given the EU push towards getting rid of all incandescent-type lamps I have ordered a couple of spares just in case production ceases. Incidentally, the mixing chambers of these enlargers are formed from polystyrene within a metal outer casing, they do not contain mirrors. |
#23
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Personal experience with a generic bulb in my LPL (badged Jessops) enlarger wasn't good. I gave up and purchased the correct bulb as specified.....
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#24
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Tungsten-halogen lamps at around 100W have a colour temperature of 2950K ...3200K at the specified voltage, depending on their original purpose. This varies significantly with applied voltage, which is why constant-voltage transformers are recommended for colour printing. I have never encountered this recommendation for B&W.
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#25
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Hi all.
I also have an LPL C7700 Would it be possible to get hold of a copy of the manual Thanks Fintan |
#26
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Quote:
Try this link
__________________
MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#27
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In all honesty I would put it down to the bulb not being quite the rated output. There is a lesson to be learned here and that is not to but items from EBay.
I have known people buy other small electrical items from EBay only to have them fail or not live up to what they purported to be. |
#28
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[QUOTE=Keith Haithwa;121068]There may be other manufacturers of suitable lamps (I haven't found one) but given the EU push towards getting rid of all incandescent-type lamps I have ordered a couple of spares just in case production ceases./QUOTE]
As far as I am aware the discontinuation of incandescent tungsten/halogen bulbs, is for household type bulbs only. Equipment requiring that specialist type of illumination will still be available. Additionally the overwhelming majority of vehicles 'dipping' headlight bulbs are still halogen type and although it is possible to convert them to use LED types, it is illegal to use them anywhere in the EU unless the vehicle was constructed to use them and given type approval by the respective countries. It is all to do with the focusing of the beam and the angle of 'dip' it can do. Also there has to be some way of cleaning the headlight lens. |
#29
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Quote:
John King: I haven't found this lamp listed as a 'specialist' item John, hence my concern (or is that paranoia). Late addition: I have just had this in fo sent to me: 'A dichroic coating is essentially a thin layer of non-metallic film, sometimes referred to as interference film, which reflects visible light from the filament forward whilst filtering infrared radiation and allowing it to pass through the back of the lamp. Since IR radiation is a significant source of heat, the net effect of this is to make the beam much cooler'. Now I appreciate that the term 'cooler' in the above quote refers to actual heat projected forward but the reduction in the amout of infrared radiation projected forward obviously must have an effect on the B&W printing paper as it is sensitive to IR. Perhaps this is the reason for the difference in lamps, just a thought.... Last edited by Keith Haithwa; 9th September 2018 at 08:26 AM. |
#30
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Unfortunately the bulb I purchased has no details on it so cannot compare it to another type. I will get an osram one at some point but currently using a Durst 370 so don't need the lpl running yet
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