From: Halvor (halvorb@mac.com)
Date: 07/10/02-08:08:21 PM Z
There exist something called HID bulbs can be obtained up to at least 1000
watt (if I remember right) bit expensive - and big - but still a bulb. They
should also in theory have a better uv coverage than mercury bulbs. I have a
500 wats version which I havnt got around to test yet. Do not have the
details of maker and so right here and now but email me and if interesting
and I will dig it out. (or is this the metal halide in a different name ?)
Halvor
on 11.07.02 03:08, Sandy King at sanking@clemson.edu wrote:
>
> Just a brief addition to the previous message as regards self
> ballasted mercury vapor lamps. These lights can be used without
> ballast in incandescent fixtures rated for the wattage. However, most
> of the high wattage lamps of this type appear to have a phosphor
> coating which shields some of the UV light. A brief search on the web
> found a couple of 150 watt units that may be of interest to some.
>
> http://homeharvest.com/spotgrowlightbulbs.htm
>
> http://www.zoomed.com/html/powersun_uv.html
>
> Possibly bulbs of this type are available in higher wattage but I
> have not so far found a source. As is I suspect they will perform
> much like the old sunlamps one used to be able to buy.
>
> Sandy King
>
>
>
>
>
>
>
>
>
>> Bob,
>>
>> The 175 watt mercury vapor street lamps are inexpensive but they are
>> far from what I would call a powerful light source. At a distance of
>> 18-20" from the printing frame I found exposure times to be be
>> unbearably long when using just one of these lamps.
>>
>> A much better source in my opinion would be a 400 or 1000 watt metal
>> halide or mercury vapor lamp, in proper housing plus ballast. Also,
>> self-ballasted mercury vapor lamps of in 250, 450 and 750 watts are
>> also available.
>>
>> In considering the use of a metal halide or mercury vapor lamp of
>> any size one should bear in mind that the most important
>> consideration after wattage is whether the lamp is coated or clear.
>> Coating, which is generally done to improve the visual qualities of
>> the light, serves as a filter to UV light and is quite undesirable
>> for our needs.
>>
>> Sandy
>>
>>
>>
>>
>>> Philippe,
>>>
>>> I don't know if you can buy one of these in Belgium, but over here
>>> its possible to buy a 150 watt mercury vapor street lamp complete
>>> with clear glass bulb for about $35 (35 euro or 175 FF). At a
>>> distance of about a half a meter they make a fair approximation of
>>> a point source and they have a long lifetime.
>>>
>>> Bob Schramm
>>>
>>>> From: Monnoyer Philippe <monnoyer@imec.be>
>>>> Reply-To: alt-photo-process-l@sask.usask.ca
>>>> To: alt-photo-process-l@sask.usask.ca
>>>> Subject: Powerfull UV point source
>>>> Date: Tue, 09 Jul 2002 10:08:26 +0200
>>>>
>>>> Hello everybody,
>>>>
>>>> I might want to switch from UV tubes to a powerfull point source in UV.
>>>> What can I find for such a source ? Is it reasonable price ?
>>>>
>>>> See you all in APIS ?
>>>>
>>>> Philippe
>>>> Belgium
>>>
>>>
>>> Check out my web page at:
>>>
>>> http://www.SchrammStudio.com
>>>
>>> also look at:
>>>
>>> http://www.wlsc.wvnet.edu/www/pubrel/photo.html
>>>
>>> _________________________________________________________________
>>> MSN Photos is the easiest way to share and print your photos:
>>> http://photos.msn.com/support/worldwide.aspx
>>
>>
>> --
>
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