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#1
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Safelight bulbs??
I have a Kodak safe light that looks like a metal cone. One end screws into
a lamp socket, the other holds a round filter. It's probably from the 1960's or older, but it's the only thing I could get here in any color except red. I bought out the last of the locally availaible little red things that use nightlight bulbs and a bunch of the bulbs, so I am covered for red, but I wanted an orange (Wratten OC) filter as I can see much better by it. The problem I have, is that here in Israel, we have been ahead of everyone else in energy saving, CFL bulbs have been sold here, and used by me, since 1997. That's good, but it has caused the demand and therefore the supply of low wattage incadescent bulbs to dry up. I found a few Chinese made 7-10 watt bulbs, but they only last a few hours. I found a 15 watt bulb sold for refrigerators, but it has a different base and I am trying to adapt it, but may not be able to get those bulbs much longer and they are very expensive being made to operate at 0F and below. The smallest incadescent bulbs that are still common here are 40 watt bulbs. What is everyone else doing for safelights? Thanks in advance, Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM |
#2
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Safelight bulbs??
Geoffrey S. Mendelson wrote:
I have a Kodak safe light that looks like a metal cone. One end screws into a lamp socket, the other holds a round filter. It's probably from the 1960's or older, but it's the only thing I could get here in any color except red. I bought out the last of the locally availaible little red things that use nightlight bulbs and a bunch of the bulbs, so I am covered for red, but I wanted an orange (Wratten OC) filter as I can see much better by it. The problem I have, is that here in Israel, we have been ahead of everyone else in energy saving, CFL bulbs have been sold here, and used by me, since 1997. That's good, but it has caused the demand and therefore the supply of low wattage incadescent bulbs to dry up. I found a few Chinese made 7-10 watt bulbs, but they only last a few hours. I found a 15 watt bulb sold for refrigerators, but it has a different base and I am trying to adapt it, but may not be able to get those bulbs much longer and they are very expensive being made to operate at 0F and below. The smallest incadescent bulbs that are still common here are 40 watt bulbs. What is everyone else doing for safelights? I use 7 1/2 watt 120 volt incandescent lamp bulbs. Whereas most incandescent lamps are designed to last about 750 hours, these little ones are designed to last 1250 hours. I do not know if I have ever had one burn out. Now if you run them at 220 volts, their lifetime would be very short. My safelights came with 15 watt bulbs, and they did not seem to fog paper, but since the lights are slightly less than the 4 feet distance from my working surfaces, I thought it would be better to use smaller lamps in them. Incandescent lamps run much longer as their input voltage is reduced. You might consider putting a suitable resistor in series with the bulb to dim the bulb slightly and increase its lifetime. The trick is to compute the proper resistance. If you measure the resistance of the bulb with an ohmmeter, it will be very low, so you will get too low a value to put in series. It is better to calculate it. If it is a 22 watt bulb at 220 volts, the bulb draws 1/10 amp, so it is 2200 ohm with a hot filament. So you might try a 110 to 220 ohm resistor to lower the voltage. You might wish to use a 5 watt resistor. Thanks in advance, Geoff. -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key: 9A2FC99A Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 07:10:01 up 40 days, 13:24, 3 users, load average: 4.02, 4.15, 4.13 |
#3
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Safelight bulbs??
Geoffrey S. Mendelson wrote:
The problem I have, is that here in Israel, we have been ahead of everyone else in energy saving, CFL bulbs have been sold here, and used by me, since 1997. That's good, but it has caused the demand and therefore the supply of low wattage incadescent bulbs to dry up. I use 3W CFL lamps in my beehive safelights. They are supposed to produce equivalent light output to 15W incandescents. They certainly seem to produce about the same amount of illumination in my darkroom, and no fogging problems when used for similar periods of time. Ian |
#4
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Safelight bulbs??
"Geoffrey S. Mendelson" wrote in message ... I have a Kodak safe light that looks like a metal cone. One end screws into a lamp socket, the other holds a round filter. It's probably from the 1960's or older, but it's the only thing I could get here in any color except red. I bought out the last of the locally availaible little red things that use nightlight bulbs and a bunch of the bulbs, so I am covered for red, but I wanted an orange (Wratten OC) filter as I can see much better by it. The problem I have, is that here in Israel, we have been ahead of everyone else in energy saving, CFL bulbs have been sold here, and used by me, since 1997. That's good, but it has caused the demand and therefore the supply of low wattage incadescent bulbs to dry up. I found a few Chinese made 7-10 watt bulbs, but they only last a few hours. I found a 15 watt bulb sold for refrigerators, but it has a different base and I am trying to adapt it, but may not be able to get those bulbs much longer and they are very expensive being made to operate at 0F and below. The smallest incadescent bulbs that are still common here are 40 watt bulbs. What is everyone else doing for safelights? If that 40 watt bulb can indeed fit in your safelight, what about hooking it up to a variable resistor? A specific one commonly available (I trust even in Israel) is the room dimmer. Get an electric/junction box which allows two switches/receptacles, one two prong receptacle, and one room dimmer. Mount the dimmer and the receptable in the box suitably wired. If desired, add a cover plate. If desired, add rubber feet/felt pads to the bottom of the box. Plug your safe light wire into the receptacle and turn on/off the safelight using the room dimmer. You may want to mark the cover plate suitably to indicate illumination levels. And connect the box to any wall receptacle using a length of suitable wire ending in a male plug - I suggest cannibalizing an plain old extension cord - cut off the female end and wire it into the box. |
#5
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Safelight bulbs??
"Geoffrey S. Mendelson" wrote in message ... I have a Kodak safe light that looks like a metal cone. One end screws into a lamp socket, the other holds a round filter. It's probably from the 1960's or older, but it's the only thing I could get here in any color except red. I bought out the last of the locally availaible little red things that use nightlight bulbs and a bunch of the bulbs, so I am covered for red, but I wanted an orange (Wratten OC) filter as I can see much better by it. The problem I have, is that here in Israel, we have been ahead of everyone else in energy saving, CFL bulbs have been sold here, and used by me, since 1997. That's good, but it has caused the demand and therefore the supply of low wattage incadescent bulbs to dry up. I found a few Chinese made 7-10 watt bulbs, but they only last a few hours. I found a 15 watt bulb sold for refrigerators, but it has a different base and I am trying to adapt it, but may not be able to get those bulbs much longer and they are very expensive being made to operate at 0F and below. The smallest incadescent bulbs that are still common here are 40 watt bulbs. What is everyone else doing for safelights? Thanks in advance, Geoff. AKA Beehive lamp. Get the smallest wattage compact fluorescent lamp you can obtain and use some layers of plain writing paper over the filter or inside against the filter. The compact fluoresent lamps have some after glow but that should not be a problem for a safelight. I don't think they run hot enough to cause problems with the paper. -- -- Richard Knoppow Los Angeles WB6KBL |
#6
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Safelight bulbs??
Richard Knoppow wrote:
AKA Beehive lamp. Get the smallest wattage compact fluorescent lamp you can obtain and use some layers of plain writing paper over the filter or inside against the filter. The compact fluoresent lamps have some after glow but that should not be a problem for a safelight. I don't think they run hot enough to cause problems with the paper. Thanks, and to everyone who suggested something. I went to another lighting store today and found a bunch of GE 15 watt bulbs (made in Hungary).I bought six, so I am set for a long time. I'm still thinking about the other possibilites as I need more safelights, and I doubt that there more Beehive lamps around (here). Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM |
#7
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Safelight bulbs??
"Geoffrey S. Mendelson" wrote in message ... Richard Knoppow wrote: AKA Beehive lamp. Get the smallest wattage compact fluorescent lamp you can obtain and use some layers of plain writing paper over the filter or inside against the filter. The compact fluoresent lamps have some after glow but that should not be a problem for a safelight. I don't think they run hot enough to cause problems with the paper. Thanks, and to everyone who suggested something. I went to another lighting store today and found a bunch of GE 15 watt bulbs (made in Hungary).I bought six, so I am set for a long time. I'm still thinking about the other possibilites as I need more safelights, and I doubt that there more Beehive lamps around (here). Geoff. -- Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM Are you not able to get these thing via eBay, they seem to turn up pretty frequently there. However, I know you have to deal with some pretty serious restrictions. I think Ilford made a similar lamp, they certainly made filters that fit the Kodak lamps. -- Richard Knoppow Los Angeles WB6KBL |
#8
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Safelight bulbs??
A 1 amp diode in series with the bulb will reduce the wattage
(but not by half). Try a 1N4004. 400V @ 1amp. About 10c or less. Murray Geoffrey S. Mendelson wrote: Richard Knoppow wrote: AKA Beehive lamp. Get the smallest wattage compact fluorescent lamp you can obtain and use some layers of plain writing paper over the filter or inside against the filter. The compact fluoresent lamps have some after glow but that should not be a problem for a safelight. I don't think they run hot enough to cause problems with the paper. Thanks, and to everyone who suggested something. I went to another lighting store today and found a bunch of GE 15 watt bulbs (made in Hungary).I bought six, so I am set for a long time. I'm still thinking about the other possibilites as I need more safelights, and I doubt that there more Beehive lamps around (here). Geoff. |
#9
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Safelight bulbs??
Will the series diode work with a compact fluorescent lamp? I think either
the clipped sine wave or the decereased voltage might not let the bulb work Although the clipped sine wave might not be a problem.. "Murray" wrote in message ... A 1 amp diode in series with the bulb will reduce the wattage (but not by half). Try a 1N4004. 400V @ 1amp. About 10c or less. Murray Geoffrey S. Mendelson wrote: Richard Knoppow wrote: AKA Beehive lamp. Get the smallest wattage compact fluorescent lamp you can obtain and use some layers of plain writing paper over the filter or inside against the filter. The compact fluoresent lamps have some after glow but that should not be a problem for a safelight. I don't think they run hot enough to cause problems with the paper. Thanks, and to everyone who suggested something. I went to another lighting store today and found a bunch of GE 15 watt bulbs (made in Hungary).I bought six, so I am set for a long time. I'm still thinking about the other possibilites as I need more safelights, and I doubt that there more Beehive lamps around (here). Geoff. |
#10
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Safelight bulbs??
On 5/9/2009 2:42 PM K W Hart spake thus:
Will the series diode work with a compact fluorescent lamp? I think either the clipped sine wave or the decereased voltage might not let the bulb work Although the clipped sine wave might not be a problem.. *Please* don't top post. Won't work (well) with most CFLs. Should work OK with dimmable CFLs. By the way, it isn't a clipped sine wave; it's a half-wave rectified sine wave. "Murray" wrote in message ... A 1 amp diode in series with the bulb will reduce the wattage (but not by half). Try a 1N4004. 400V @ 1amp. About 10c or less. Murray Geoffrey S. Mendelson wrote: Richard Knoppow wrote: AKA Beehive lamp. Get the smallest wattage compact fluorescent lamp you can obtain and use some layers of plain writing paper over the filter or inside against the filter. The compact fluoresent lamps have some after glow but that should not be a problem for a safelight. I don't think they run hot enough to cause problems with the paper. Thanks, and to everyone who suggested something. I went to another lighting store today and found a bunch of GE 15 watt bulbs (made in Hungary).I bought six, so I am set for a long time. I'm still thinking about the other possibilites as I need more safelights, and I doubt that there more Beehive lamps around (here). -- Save the Planet Kill Yourself - motto of the Church of Euthanasia (http://www.churchofeuthanasia.org/) |
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