From: Sandy King (sanking@CLEMSON.EDU)
Date: 10/29/01-09:00:56 AM Z
Alejandro,
In theory the TL'DK should give you faster printing since it is
working at double the wattage of the TL'D. I would go for the 30 watt
tubes.
However, I would try to find the Philips Super Actinic 03 tube,
especially if you are printing with platinum and speed of printing is
important. The spectral chart of the regular Actinics suggest that
they put out a lot of their radiation at wavelengths not useful to
many of the alternative printing processes.
Sandy
>Hi Sandy:
>
>I am building my first UV Exposure Unit. I have a dilemma in choosing
>between the following lamps:
>
>a- Philips Actinic TL'D 15 Watts/05
>b- Philips Actinic TL'DK 30 Watts/05
>
>I have narrowed down to Philips, because since I am based in Europe, here is
>much easier to find Philips lamps than other manufacturers. Also, I have
>chosen these to wattage, because both lamps are 45 cm long, and I don't need
>a larger UV Exposure Unit.
>
>In essence, the question is: Should I go for a 15 Watt lamp or a 30 Watt
>lamp? My box will have an eight lamp configuration?
>
>Regards,
>
>Alejandro López de Haro
>----- Original Message -----
>From: "Sandy King" <sanking@clemson.edu>
>To: <alt-photo-process-l@sask.usask.ca>
>Sent: Monday, October 29, 2001 4:22 AM
>Subject: BLs and BLBs: The Unexpected Result!
>
>
>>
>> Today I borrowed some new Phillips BL tubes from Sam Wang and tested
>> these tubes against my old bank of Sylvania 350BL tubes and the new
>> GE BLB tubes used in previous experiments with Van Dyke, Cyanotype
>> and gum. These tests resolved some of the questions raised by the
>> first tests. In the current set of tests it is clear from initial
>> observation that the Phillips BL tubes provide much more speed than
>> the older Sylvania 350BLs, on the order of about 1.5 stops with all
>> of these processes.
>>
>> However, these tests did not entirely erase the first unexpected
>> results because the performance from the Phillips BL tube and the GE
>> BLBs was virtually identical both in terms of the speed point and in
>> the number of total steps. There was, simply put, no discernible
>> difference between the two. I will test again to verify the results,
>> but assuming consistency in the results I would predict identical
>> performance from these specific makes of BL and BLB bulbs. In my own
>> case I plan to replace my Sylvania 350BLs with a new set of the GE
>> BLBs, if for no other reason simply because I can pick the BLBs up at
>> the local Lowes.
>>
>> That is about the end of what I have to say on this subject for the
>> time being. I have completed most of the tests I planned to run and
>> hope to be able to wrap up the article within the next 10-14 days.
>>
>> Sandy King
>>
>>
>>
>>
>>
>>
>>
>>
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