Results 1 to 5 of 5

Thread: Fluorescent Grow Light Bulbs for alternative printing.

  1. #1

    Join Date
    May 2006
    Location
    North Orange County, Southern California
    Posts
    122

    Fluorescent Grow Light Bulbs for alternative printing.

    I have a light fixture for alternative printing and I am wondering if these Fluorescent tube are of the correct wavelength?

    8-Pack AgroMax 4 Foot (45.75") Pure PAR Veg T5 Fluorescent Grow Light Bulbs - (8) F54T5HO Bulbs
    by HTGSupply

    These are from Amazon.

    My light fixture is designed for the T5 size of Fluorescent tubes.

    Thanks in advance.

    Gary
    "People take different roads seeking fulfillment and happiness. Just because they're not on your road doesn't mean they've gotten lost." - H. Jackson Brown

  2. #2
    Vaughn's Avatar
    Join Date
    Jan 2007
    Location
    Humboldt County, CA
    Posts
    7,301

    Re: Fluorescent Grow Light Bulbs for alternative printing.

    Google the company that make the lamps -- they usually will have the wave lengths graphed out.

    PS. Most units I have worked with use the BL tubes...cheaper and as effective (if not more) than the BLB.

    Edited to add. I wish Agromax would have included the spectrum output of their lights on their site. I am hesitant to recommend the AgroMax Pure UV T5 Bulb – 4 Foot tube. Besides UVA (320-400), it is designed to emit UVB (280-320), which alt processes in general are sensitive to, but 1) it is damaging to skin and eyes and 2) if you are using a contact printing frame with glass, most of that UVB will be blocked by the glass*....so one might be exposing oneself to damaging rays that aren't helping much.

    The AgroMax Pure PAR Veg T5 Fluorescent Grow Light Bulbs seem to be a better choice of the two, depending what its output really is. BL tubes peak at 350.

    * 95% as per Sandy King...https://sandykingphotography.com/res...s-for-printing
    Last edited by Vaughn; 28-Aug-2019 at 13:54.
    "Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China

  3. #3

    Join Date
    Jul 2018
    Location
    Vermont
    Posts
    12

    Re: Fluorescent Grow Light Bulbs for alternative printing.

    I can’t speak to that specific bulb as to wether it will work or not, but looking at the spectrum it seems the wavelengths may be too long as there isn’t much output below 400nm. I also use a grow light as my exposure unit. There are two bulbs that’s I know work, at least for cyanotype and pt/pd. They are:

    1. AgroMax Pure UV T5 Bulb – 4 Foot
    These have an emission peak at around 365nm with a pretty narrow spectrum. They work well if you are using in camera negatives, however they tend to produce long exposure times (30mins for a cyanotype) when using digital negatives printed on pictorico as it blocks a significant portion of the up output.

    2. Eye Hortilux Power VEG 420
    These have an emission peak around 420nm. These work well for both in camera and digital negatives on pictorico and gives very fast exposure times, in the 2-4 minute range for pt/pd and 6-8 for cyanotype from a distance of around 6 inches. The pt/pd exposure times are probably too fast and I am considering moving the light further as I think I loose shadow contrast with an exposure that short.

    I hope this helps.

    Nick

  4. #4

    Join Date
    May 2006
    Location
    North Orange County, Southern California
    Posts
    122

    Re: Fluorescent Grow Light Bulbs for alternative printing.

    Quote Originally Posted by NHE View Post
    I can’t speak to that specific bulb as to wether it will work or not, but looking at the spectrum it seems the wavelengths may be too long as there isn’t much output below 400nm. I also use a grow light as my exposure unit. There are two bulbs that’s I know work, at least for cyanotype and pt/pd. They are:

    1. AgroMax Pure UV T5 Bulb – 4 Foot
    These have an emission peak at around 365nm with a pretty narrow spectrum. They work well if you are using in camera negatives, however they tend to produce long exposure times (30mins for a cyanotype) when using digital negatives printed on pictorico as it blocks a significant portion of the up output.

    2. Eye Hortilux Power VEG 420
    These have an emission peak around 420nm. These work well for both in camera and digital negatives on pictorico and gives very fast exposure times, in the 2-4 minute range for pt/pd and 6-8 for cyanotype from a distance of around 6 inches. The pt/pd exposure times are probably too fast and I am considering moving the light further as I think I loose shadow contrast with an exposure that short.

    I hope this helps.

    Nick
    Nick, thank you for the very informed response.

    I was researching the AgroMax Pure UV T5 Bulb – 4 Foot and that is what prompted my question.

    Thanks again
    Gary
    "People take different roads seeking fulfillment and happiness. Just because they're not on your road doesn't mean they've gotten lost." - H. Jackson Brown

  5. #5

    Join Date
    May 2006
    Location
    North Orange County, Southern California
    Posts
    122

    Re: Fluorescent Grow Light Bulbs for alternative printing.

    Thank you Vaughn and Nick for your responses.

    Gary
    "People take different roads seeking fulfillment and happiness. Just because they're not on your road doesn't mean they've gotten lost." - H. Jackson Brown

Similar Threads

  1. Replies: 14
    Last Post: 4-Aug-2017, 17:51
  2. Replies: 15
    Last Post: 15-Sep-2014, 12:14
  3. Replies: 9
    Last Post: 7-Apr-2008, 11:34
  4. fluorescent light
    By tao in forum Style & Technique
    Replies: 6
    Last Post: 30-Apr-2000, 23:50
  5. fluorescent light source for enlarger
    By Colin Seaman in forum Darkroom: Equipment
    Replies: 3
    Last Post: 9-Jul-1999, 15:17

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •