{"id":11870,"date":"2015-06-21T19:29:01","date_gmt":"2015-06-22T01:29:01","guid":{"rendered":"http:\/\/jbhphoto.com\/blog\/?p=11870"},"modified":"2018-08-22T14:34:42","modified_gmt":"2018-08-22T20:34:42","slug":"thomas-duplex-safelight-sox","status":"publish","type":"post","link":"https:\/\/www.jbhphoto.com\/blog\/2015\/06\/21\/thomas-duplex-safelight-sox\/","title":{"rendered":"THOMAS DUPLEX SAFELIGHT &#038; SOX"},"content":{"rendered":"<h4 style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-11878\" src=\"http:\/\/jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/TDuplex001-400x262.jpg\" alt=\"\" width=\"304\" height=\"199\" srcset=\"https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/TDuplex001-400x262.jpg 400w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/TDuplex001-150x98.jpg 150w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/TDuplex001.jpg 567w\" sizes=\"auto, (max-width: 304px) 100vw, 304px\" \/><strong>Had an interesting discussion the other day with a group of photographers about the Thomas Duplex Super-Safelight.\u00a0 This is one of the best safelights you can own.\u00a0 They are bright, powerful and will fog your paper before you can say Look Out!\u00a0 Honestly, these things are designed to light a very large darkroom, I would say, far beyond the size that most of us are accustomed to having the privilege of owning.\u00a0 They come with several glass-mounted filters that are designed for different darkroom uses, but there seems to be a lot of confusion as to what filters to use and how this all works.<\/p>\n<p>So, let&#8217;s begin by trying to better understand just how the Thomas Duplex Super-Safelight works.\u00a0 This is really an ingenious device that uses technology designed for something completely different.\u00a0 If you have ever looked inside of the unit you will see a strange looking glass lamp.\u00a0 This is the heart of the Super-Safelight. . . a Low Pressure Sodium lamp. . . designated in the industry as an SOX lamp.\u00a0 Without getting into a lot of very technical talk, this SOX lamp is an extremely bright light producing device. . . you get a lot of light per watt of electricity used.\u00a0 But there is a trade-off. . . the spectral output of the lamp is extremely narrow.\u00a0 In the simplest terms, there is a lot of light, but it is just one color.\u00a0 How this narrowband light is generated and the details of the lamp itself are way too complicated for this discussion.\u00a0 For the photographer, how to use the lamp is much more important.\u00a0 You do not need to know how to build a car from a block of metal to drive it.\u00a0 If you are really. . . really. . . really. . . interested in the technical stuff, here is a <span style=\"text-decoration: underline;\"><a href=\"https:\/\/en.wikipedia.org\/wiki\/Sodium-vapor_lamp\" target=\"_blank\">LINK<\/a><\/span>.\u00a0 Also an Internet search will turn up even more technical info.<\/p>\n<div id=\"attachment_11879\" style=\"width: 342px\" class=\"wp-caption alignright\"><a href=\"http:\/\/jbhphoto.com\/blog\/2015\/06\/21\/thomas-duplex-safelight-sox\/wave01\/\" rel=\"attachment wp-att-11879\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11879\" class=\"wp-image-11879\" src=\"http:\/\/jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/Wave01-400x295.jpg\" alt=\"Spectrum\" width=\"332\" height=\"245\" srcset=\"https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/Wave01-400x295.jpg 400w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/Wave01-150x111.jpg 150w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/Wave01.jpg 692w\" sizes=\"auto, (max-width: 332px) 100vw, 332px\" \/><\/a><p id=\"caption-attachment-11879\" class=\"wp-caption-text\"><center>Electromagnetic Spectrum<\/center><\/p><\/div>\n<div id=\"attachment_11876\" style=\"width: 311px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/jbhphoto.com\/blog\/2015\/06\/21\/thomas-duplex-safelight-sox\/sox18a\/\" rel=\"attachment wp-att-11876\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11876\" class=\"  wp-image-11876\" src=\"http:\/\/jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOX18a-400x101.jpg\" alt=\"SOX18\" width=\"301\" height=\"76\" srcset=\"https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOX18a-400x101.jpg 400w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOX18a-150x38.jpg 150w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOX18a-950x241.jpg 950w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOX18a.jpg 1204w\" sizes=\"auto, (max-width: 301px) 100vw, 301px\" \/><\/a><p id=\"caption-attachment-11876\" class=\"wp-caption-text\"><center>Low Pressure Sodium Lamp<\/center><\/p><\/div>\n<p>What we photographers are really interested in is the spectral output of the lamp.\u00a0 The SOX lamp produces a virtually monochromatic light, averaging about 589.3nm wavelength.\u00a0 I know, more of that technical talk.\u00a0 What is important to know is that this wavelength of light from the SOX lamp is outside the main spectral sensitivity of B&amp;W printing papers.\u00a0 This is what makes the Super-Safelight unique.<\/p>\n<p>So, roughly speaking, we can say that graded papers are mostly blue sensitive, and VC papers are mostly sensitive to blue and green light.\u00a0 Again, roughly speaking, graded papers are mostly sensitive to about 450-500nm wavelengths.\u00a0 While VC papers are roughly most sensitive to about 400-570nm wavelengths.<\/p>\n<p>Now with a rudimentary understanding of the SOX lamp spectral output, it becomes obvious that it is well suited for use in a photographic safelight.\u00a0 The thing is, these lamps put out so much light that they are a danger to photographic printing papers.\u00a0 If you look at the spectrum, you will also notice there are other wavelengths in the blue and near green that can cause fog.\u00a0 A proper cutoff filter will remove them.<\/p>\n<div id=\"attachment_11875\" style=\"width: 363px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/jbhphoto.com\/blog\/2015\/06\/21\/thomas-duplex-safelight-sox\/lpsspect02\/\" rel=\"attachment wp-att-11875\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11875\" class=\"wp-image-11875\" src=\"http:\/\/jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/LPSSpect02-400x222.jpg\" alt=\"SOX Lamp Spectrum\" width=\"353\" height=\"196\" srcset=\"https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/LPSSpect02-400x222.jpg 400w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/LPSSpect02-150x83.jpg 150w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/LPSSpect02.jpg 650w\" sizes=\"auto, (max-width: 353px) 100vw, 353px\" \/><\/a><p id=\"caption-attachment-11875\" class=\"wp-caption-text\"><center>Spectral output of SOX Lamp<\/center><\/p><\/div>\n<p>Even with the greatest spectral output beyond the main sensitivity range of the papers, if you expose the paper to too much light you will get fog.\u00a0 You have to attenuate the SOX lamp output even further.\u00a0 I have made my own filters for my Thomas Duplex Super-Safelight and it is not that difficult, nor is it expensive.\u00a0 I have another post on this BLOG that deals with the proper cutoff filter and using ND filters to tame down the light output.\u00a0 You will find the post titled, &#8220;<span style=\"text-decoration: underline;\"><a href=\"http:\/\/jbhphoto.com\/blog\/2012\/08\/20\/thomas-duplex-super-safelight-filters\/\" target=\"_blank\">THOMAS DUPLEX SUPER SAFELIGHT FILTERS<\/a><\/span>&#8221; contains the details of how to make your own B&amp;W filters.<\/p>\n<p>You will also note in this previous post that I have replaced the lamp in the Super-Safelight we use.\u00a0 The stock unit comes with a 35 watt (SOX35) lamp, which in reality is way too much light for the small darkroom.\u00a0 The thing is just way too bright for our darkroom which is 9 1\/2 x 16 feet.\u00a0 Realize that there is no practical way to electrically dim the lamp.\u00a0 So, I did what I usually do with most everything around here; I looked to modify how it works.<\/strong><\/h4>\n<h4 style=\"text-align: justify;\"><strong>Doing a little research I found that the smallest SOX lamp available was 18watts (SOX18).\u00a0 That is what I wanted; less wattage; less light!\u00a0 If you choose to do this, keep in mind that the ballast and capacitor are specific to the lamp.\u00a0 If you want to change the lamp wattage, you have to purchase the appropriate ballast and capacitor.\u00a0 If you are not comfortable working with electricity, please ask for help, or do not attempt this.\u00a0 But, if you decided to move to the lower power lamp, there isn&#8217;t much to it.\u00a0 You simply swap out the ballast, the capacitor and the lamp.<\/p>\n<div id=\"attachment_11877\" style=\"width: 279px\" class=\"wp-caption alignright\"><a href=\"http:\/\/jbhphoto.com\/blog\/2015\/06\/21\/thomas-duplex-safelight-sox\/soxballast01\/\" rel=\"attachment wp-att-11877\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11877\" class=\"wp-image-11877 size-full\" src=\"http:\/\/jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOXBallast01.jpg\" alt=\"Ballast &amp; Cap\" width=\"269\" height=\"168\" srcset=\"https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOXBallast01.jpg 269w, https:\/\/www.jbhphoto.com\/blog\/wp-content\/uploads\/2015\/06\/SOXBallast01-150x94.jpg 150w\" sizes=\"auto, (max-width: 269px) 100vw, 269px\" \/><\/a><p id=\"caption-attachment-11877\" class=\"wp-caption-text\"><center>SOX Magnetic Ballast &amp; Capacitor<\/center><\/p><\/div>\n<p>Using the SOX18 lamp will greatly decrease the light output of the Super-Safelight.\u00a0 This coupled with the use of the proper cutoff filter and ND filters will allow you to tame the light output to a manageable level in the smaller darkroom.<\/p>\n<p>NOTE:\u00a0 One more thing; the stock Thomas Duplex Super-Safelight uses the older magnetic ballast and external capacitor.\u00a0 This is what I used and this was near 20 years ago.\u00a0 Now you can purchase an electronic version of the ballast but I have absolutely no experience with them, so you are on your own there.<\/p>\n<p>Now you know how the Thomas Duplex Super-Safelight works, and hopefully how to best use it in your darkroom.\u00a0 Do Not Forget to TEST to be sure your safelight is SAFE!<\/p>\n<p>JB<\/strong><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>Had an interesting discussion the other day with a group of photographers about the Thomas Duplex Super-Safelight.\u00a0 This is one of the best safelights you can own.\u00a0 They are bright, powerful and will fog your paper before you can say Look Out!\u00a0 Honestly, these things are designed to light a very large darkroom, I wouldContinue reading &rarr;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[99,5,12,9],"tags":[15,16,17,18,122,126,20],"class_list":["post-11870","post","type-post","status-publish","format-standard","hentry","category-bw-paper","category-darkroom","category-how-to","category-photography","tag-darkroom-2","tag-film-photography","tag-fine-art-photography","tag-jb-susan-harlin","tag-safelight","tag-thomas-duplex-super-safelight","tag-ulf-photography","no-thumb"],"jetpack_publicize_connections":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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