Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,481   Posts: 1,542,709   Online: 966
      
Results 1 to 10 of 10
  1. #1

    Join Date
    Feb 2004
    Location
    Lobsta
    Shooter
    Multi Format
    Posts
    566

    Fluorescent Lamp Sockets for Exposure Box

    I'm in the process of putting together an exposure box for contact printing and am a little confused on the sockets. The lamps will be F20T12BL, 24" long (because of limited counter space) and will have medium bi-pin connectors. In shopping, virtually all of the lamp holders (sockets) I've seen have grooves which are designed to mate with a stamped or punched rectangular opening in 22ga (or so) sheet metal. I'm not set up to do sheet metal work. What I'd like to do is mount the sockets directly to the plywood from which the box is constructed. The standard sockets have a single screw hole, but it doesn't look very secure.

    Does anyone have any suggestions?

    Thanks,
    Will
    My Verito page

    Anyone can appreciate a fine print. But it takes a real photographer to appreciate a fine negative.

  2. #2

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    Will, at work right now but think I found a web site that has some that can be screw mounted. Update when I get home. Good question because the one I built was using a shop type single light, harder to keep the lights closer.
    Mike C

    Rambles

  3. #3

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    Quote Originally Posted by photomc
    Will, at work right now but think I found a web site that has some that can be screw mounted. Update when I get home. Good question because the one I built was using a shop type single light, harder to keep the lights closer.

    Will, as promised.. http://doityourself.com/store/fluore...artsandpan.htm

    Keep posted on your light source. The first one I did is a proto type for the next one. Also, I could not find electronic ballast for the F20T12 bulbs, so if you do let me know.
    Mike C

    Rambles

  4. #4
    donbga's Avatar
    Join Date
    Nov 2003
    Shooter
    Large Format Pan
    Posts
    2,078
    Will,

    The sockets can be screwed on. I've made 3 12 tube units with sockets that are srewed on. The sockets are 1-3/4 inch OC which means the tube gap is very tight, but that also means the illumination is very even.

    Don Bryant

  5. #5

    Join Date
    Jan 2004
    Location
    Manhattan Beach, CA
    Shooter
    8x10 Format
    Posts
    448
    Images
    19
    There is only one screw per socket, so theoretically the wear and tear fairy could loosen that screw enough to turn in your box when replacing bulbs. I solved this (I think - mine is less than a year old) by backing up each socket with a strip of wood. This traps the base so it can't swivel. I used a #8 x 3/4 round headed wood screw into fir, and put a bit of Elmer's glue on the base for good measure. The cutout for the screw is shouldered in the plastic and the final result seems very stable.

    I looked for a ballast that would support 4 bulbs, but did not find any. Therefore I have 6 ballasts for 12 bulbs. It was painful at the checkout counter, but made wiring a snap.

    I spaced the C/L of the sockets 1-1/2 in. apart. This means no finger room between bulbs, and I have to remove #s 12, 11, 10, and 9 to get to #8. This gives a nice, even illumination and relatively short exposures when 4 in. away from the print frame.

  6. #6

    Join Date
    Feb 2004
    Location
    Lobsta
    Shooter
    Multi Format
    Posts
    566
    Mike,

    Thanks for the link. Those look almost identical to the ones I found at Home Depot. They do have one hole for screw mounting, but it seemed a little inadequate. Probably it will work just fine, though, as Don indicates. And their price certainly looks favorable.

    I have found a link for electronic ballasts at American Light. They also have a 3-bulb model for around $28.00 which the salesperson told me about, but which I did not find listed on the page. It may be more economical depending upon your application. I don't see any reason not to use the 3-bulb ballasts and will probably order those myself.

    -Will

    Quote Originally Posted by photomc
    ...could not find electronic ballast for the F20T12 bulbs, so if you do let me know.
    My Verito page

    Anyone can appreciate a fine print. But it takes a real photographer to appreciate a fine negative.

  7. #7

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    Will, Thanks for the info on the ballast. Had looked there, but did not consider calling because nothing was listed. Don't see any reason a 3 bulb would not work. BTW, mis-read your original post, thought you needed to find a screw in lampholder, sorry. I agree that it does not seem all that stable, wonder if a thin strip of wood or other support on each side of the holder would help. Interested to here what others have done.
    Mike C

    Rambles

  8. #8
    donbga's Avatar
    Join Date
    Nov 2003
    Shooter
    Large Format Pan
    Posts
    2,078
    Quote Originally Posted by photomc
    Will, Thanks for the info on the ballast. Had looked there, but did not consider calling because nothing was listed. Don't see any reason a 3 bulb would not work. BTW, mis-read your original post, thought you needed to find a screw in lampholder, sorry. I agree that it does not seem all that stable, wonder if a thin strip of wood or other support on each side of the holder would help. Interested to here what others have done.
    The screw mounted sockets are very stable, I place a large washer under each socket. On each side of the of the surface the sockets are mounted to, I've cut a large slot, that allows the sockets to be easily moved in one direction or the other to make socket positioning easy, accurate, and provides simple routing of the wires going to each of the sockets.

    Don Bryant

  9. #9

    Join Date
    Feb 2004
    Location
    Lobsta
    Shooter
    Multi Format
    Posts
    566
    Mike,

    I think between Glenn's and Don's suggestions I now feel reassured that the readily available bi-pin holders will work fine, anchored as they've suggested. I'll go ahead with what I've got on hand and probably order the rest from the link you provided.

    Now that I'm home and have my notes, the ballast for 2 bulbs is the REL2S40SC which at this writing has a price of $22.62. The 3-bulb ballast is REL3S40SC which is priced at 27.62. American Light has several offices apparently. The one I called is in Dallas at (214) 217-0190.

    I appreciate everyone's input. As I progress with this, I may have more questions. It will be nice to be able to finally get around to printing!

    -Will

    Quote Originally Posted by photomc
    Had looked there, but did not consider calling because nothing was listed.
    My Verito page

    Anyone can appreciate a fine print. But it takes a real photographer to appreciate a fine negative.

  10. #10

    Join Date
    Feb 2003
    Location
    North of Calgary, Alberta. Canada
    Posts
    166
    Here's the ballast that I am using in mine. Five lights to one ballast sure holds the weight down as well as making the building easier.

    Fulham workhorse ballasts

    Hope this may help.

    Kind Regards,
    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin