RE: intensity of bulbs
The length of the tubes is primarily determined by the maximum size of the print you wish to make - plus a margin to avoid light fall-off at the ends. I use 24" tubes to print 20" negs without a problem. At the same distance from the tubes the light intensity is proportional to the power of the tube (assuming the same type, efficiency etc). So a 40w tube would be twice as bright as the 20w tube. Geoff Chaplin ジェフ チャップリン geoff@geoffgallery.net www.geoffgallery.net Skype: geoffchaplin1611 UK mobile (英国の携帯電話): +44(0) 7770 787069 Japan mobile (日本の携帯電話): +81(0) 90 6440 7037 Japan land line / fax (日本の電話とファクス): +81(0) 166 92 5855 -----Original Message----- From: Barry Singer [mailto:bsinger@sasktel.net] Sent: 24 February 2009 07:18 To: alt-photo-process-l@usask.ca Subject: intensity of bulbs A cursory search of the archives doesn't help me answer this question. Perhaps some one can help? Does a 24" bulb at 20 watts have the same intensity as a 48" bulb at 40 watts? Barry
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