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Thread: 480 LED desk lamp modding with awesome brightness.

  1. #1

    Default 480 LED desk lamp modding with awesome brightness.

    Hi Guys!

    A couple of days ago, I finally finished my first fixed LED project.

    I like my government's decision to drastically reduce the size of Germany's armed forces.
    Firstly, this reduces cost for the taxpayers, and secondly, a lot of sparingly used equipment from closed bases with awesome quality is now available on ebay.
    This is where it all started. The reputable lamp factory SIS Germany offers a nice desk lamp for around €200.



    I found the same type on Ebay for around €30, coming from old Bundeswehr inventory.

    This lamp is made to last. All metal, a sturdy construction, a nice design and easy to work with. Everything is bolted together, no hidden clips, rivets or glue.
    Orignially it came with 2 pityful 9W CFL lamps, but the head was stripped of those and their sockets quickly.
    What this lamp is missing at it's head is a handle, and a switch, so I installed these first. I also changed the part that connects the head to the arm, as I did not need a sidewards swivel joint. The old part lies in the middle. Then I installed a 670mA LED driver with a range of 35-70V. It refused to work properly at first, until I found out that there is a hidden CFL ballast in the lamp arm. After disconnecting that ballast, the problems were gone.



    The extruded head allows to slide in an aluminium sheet of 203x167x1.5mm, so I ordered some of them from a machine shop. Next I got some cheap LED strips from ebay with 120 Leds/m.
    I put them on the aluminium sheet, and used a warm white one in every third position, as I did not want the light to be completely cool. I wired them 5s4p. This way, I have 5 groups connected in series, with each group consisting of 4 strips in parallel, each 200mm long. The result needs 58V and works well on 670mA.



    I connected this to the driver, and assembled everything. It works like a champ! The output is so much better then the 100W incan I had before. Although I am a tint snob on flashlights, where I prefer neutral white, the tint on the cooler side works really well on this desk lamp. It looks futuristic and encourages activity and productivity. I could not be happier with this light, and considering I paid €30 for it, €15 for the driver and LEDs each and €10 for the switch and handle, it is an awesome bargain. I have 2 more in the basement waiting for LED installation.

    Here are some more pictures:



    Lamp head from behind. The handle is a type also used on a server rack.



    Fixing on the desk.



    The new lamp with the old one behind it.



    Quite bright indeed.



    The old lamp:




    Photo album:

    http://imgur.com/a/lPyAo#2

    http://imgur.com/a/cfG9T

    LED strips I used:
    http://www.ebay.de/itm/190648195210?...84.m1439.l2649

    (120 Leds/meter, "white" and "warm white")

    For similar projects with a different number of LEDs or strips, I recommend a cheap 12V/5A laptop power supply instead of the one I used.

    Cheers,

    Julian
    Last edited by Julian Holtz; 07-02-2013 at 11:22 AM.
    This message was morsed into the open end of a fiber-optic cable with a flashlight.

  2. #2
    Flashaholic
    Join Date
    Oct 2008
    Location
    cali
    Posts
    472

    Default Re: 480 LED desk lamp modding with awesome brightness.

    Good work!

    I always love retrofits in old lamps like that.

  3. #3

    Default Re: 480 LED desk lamp modding with awesome brightness.

    Some better modding in this new thread:

    http://www.candlepowerforums.com/vb/...61#post4157661
    Last edited by Julian Holtz; 03-10-2013 at 11:19 AM.
    This message was morsed into the open end of a fiber-optic cable with a flashlight.

  4. #4
    Administrator Norm's Avatar
    Join Date
    Jun 2006
    Location
    Australia
    Posts
    9,140

    Default Re: 480 LED desk lamp modding with awesome brightness.

    Your images are oversize, when you post an image please remember Rule #3

    Rule #3 If you post an image in your post, please downsize the image to no larger than 800 x 800 pixels.

    Please resize and repost. - Thanks Norm

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