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> Halogen Lamps to be banned |
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#1
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Halogen Lamps to be banned
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#2
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I recall a thread on Photrio about this some time ago i.e a few years ago in which there seemed to be an exception for the kind that are used in colour enlargers.
I have no idea whether that exception still holds good If it doesn't then we are left a little high and dry if we used colour heads. My understanding is that few if any LEDs produce the right colour range for colour processing and give the size of the halogen enlarger bulb market I have grave doubt that the demand for the right kind of LED bulb for colour enlargers is anything like big enough for bulb manufacturers to cater for our needs So quite where we go from here to get a solution is a mystery for me. A bit worrying unless as I said, unless certain kinds of halogen are exempt. Mike |
#3
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Halogen bulbs
The vast majority of vehicles still use Halogen bulbs for their headlights and they cannot easily be changed for LED equivalent either. Apart from technical fitting which can be done relatively easily, the Construction and Use Regs under more than one Road Traffic Act require the suspension to be variable and be fitted with suitable head lenses that ensure drives are not blinded..
On the other hand, another broad statement by the media without looking into the various "ins and outs" and not waiting for definitive legislation, just headline grabbing soundbites. As for halogen bulbs in enlarger lamps I think I may have enough to last me into the next century anyway and I have a box full of halogen bulbs that will fit my motorcycles and cars. |
#4
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Yeah, I'm sure specialist lamps will be retained - they are too widespread and impractical to convert to LED (tho I for one would welcome LED based 250W lamps for my Durst to cut down the heat generated!). They will always be available by private import from overseas so even if worst comes to worst, it will just be another minor inconvenience and extra cost...
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#5
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The other approach is to stock up more than enough to see you out. Not such a problem with cheap items, but not good if they're expensive.
I have spare Zone VI cold light tubes that I'll never use from the days of graded paper, and nobody else will want them either most probably. I'm sure I'm not the only one: there are plenty of ebay ads for unused old stuff that people thought they would use but didn't need to or get around to. |
#6
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In typical enlargers, low-voltage tungsten-halogen (TH) bulbs are built into reflectors and are used in colour or Multigrade heads, where the colour of the exposing light can be adjusted. Replacing them with LEDs presents several problems:
1. The first, and most obvious, is the spacing of the pins, which is hinted at in the naming of the bulb - the number at the end of the description indicates the spacing in mm. LED bulbs have plastic housings and the pins can be bent without risk of cracking glass or ceramic. 2. Although it appears white, the emitted light is assembled from several phosphors excited by the blue light from the light-emitting diode. This will alter the effect of Multigrade filters and need a lot of experimentation for colour printing. 3. The original TH bulbs had compact low-voltage filaments and hyperbolic-parabolic reflectors that focused an image of the filament accurately towards the entrance pupil of the light-mixing chamber. Dichroic filters wound into the light-path would have a predictable effect on the colour of the light because the conical beam could be designed into the shape of the cams that define the filter position. But LED replacements typically emit a Lambertian distribution - effectively over a wide angle - and the precise conical beam control will be absent. So the filtration will not be predictable. In extreme cases it may be necessary to revert to separate gel filters. This topic will no doubt result in a great deal of correspondence on how to overcome these problems in years to come. In the meantime, stock up on TH bulbs! |
#7
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Out shopping for groceries this morning, and from interest looked at the lighting section.
Approximately four inch tubular lamp for my p.i.r. garden security flood lights costs £1.55p . The equivalent LED replacement £6.73p . I already have a load of 15watt pygmy bulbs stashed for my safelights. Now it looks like it will be a case of 100 Watt bulbs for my enlarger and one of halogen tube lights. When are they going to get around to tubular fluorescent lights? Apparently if you are in business you cannot throw them down the tip when faulty as they contain a miniscule amount of mercury. They are required to be disposed of by specialist contactors. "The way things are going I will be lucky to get out of this world alive." W.C.Fields. Cheers.
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It will all be over by Christmas. |
#8
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Here in Germany they are banned since a few years. The ban is thought for illumination purposes, not for special purposes. I assume that the settlement in the UK will be similar.
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#9
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Quote:
I agree this is the possible scenario and makes common sense, but when have the legislators been known for common sense. Likewise (and going off subject a little. All new IC engined vehicles will be banned from sale in 2030. There has been no mention of large goods vehicles. With a limited range, the carriage of goods and specialised items will be severely hampered if they insist on electrifying lorries with there lengthy charging times.. There has been no mention of them being exempt. Terms like headlong into the abyss comes to mind. |
#10
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Quote:
Thanks pentaxuser |
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