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Thread: home made spot light 120W UHP

  1. #1
    Enlightened sven_m's Avatar
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    Default home made spot light 120W UHP

    Yet another home made mini project everyone,



    Recently I started reading more here again (mainly HID section) and I thought I'd have a share in here
    by introducing me and my spotlight dependence with this report about another home made HID.

    Some time ago, by pure coincidence I got hands at
    - a 120W UHP bulb
    - including the invaluable ballast (Osram)
    And in connection with
    - a modified 24-30V/230V stepup converter, to provide the required 300V for the ballast
    - two 4S 14.8V 5Ah LiPos in series
    - volt warners
    - and a bunch of parts within reach for the chassis, the most prominent being
    - a nice green pvc sewer tube!
    ...I could start all this.

    Just to have an immediate full stop.
    because the step up converter doesn't accept more than 30V and the two LiPos had slightly more.
    I already had a 4S battery for another lamp, that's why I bought a second one (to save money. ha! what a silly idea...)
    So I purchased a 2S 5Ah from Hongkong to get a 6S chain in series, and then, holy gee!, the german customs confiscated it
    (because meanwhile there's a horribly nasty import issue about a required "CE" sign, and the customs believing it)
    Thus I had to purchase another battery from an inner-EU country.

    Now I could do a first unassembled test run which looked fine!
    (cell phone picture)



    Next I had to assemble all the stuff,



    ...did various silly things for several hours, and eventually got this far,



    with the front looking like this (get anything which remotely works, but just get it),
    simply having scissored a metal sheet with the grinder, with the bulb being fixed into with epoxy glue.



    Ok, now it was portable.

    So what do beam shots look like?
    I compared it with a Vector PowerOnBoard (SLH100P) (I'm so glad that one went astray to germany on ebay)
    and an EagleTac M3C4 single XML-L,




    Here's the long shot, looking along the Donau (danube river) in Ulm, southern germany, where I am located by the way,



    The distance to the higher white building in the background is about 635m/2080' (according to google earth)
    and the stone column below (located on an isle in the river and illuminated by default) about 315m/1030'.

    I couldn't see the EagleTac on the building anymore, so here's the far distance without it
    (ISO 100, 2 sec, F5.2, 23.7mm, earlier sony cybershot)

    635m -- control shot | POB 35W | home-made 120W UHP



    and here, targeting the column,
    315m -- EagleTac XM-L | POB 35W | home-made 120W UHP



    I'd say I'm more than happy with the result!



    Not until later, when puzzling with the pics, I noticed three guys sitting in the front of the stone column!
    (enlarged snippet),




    and these guys had visited me not much later after this shot. We had a nice talk,
    the first word was "bazooka!" (not sure if that was meant as praise or blame),
    and then the usual questions from people which until then had not known that flashaholics exist,
    "whatcha doing with that?!", well nothing, but having lots of fun ;-)
    Then they said "thought it was just a flash light" and I was tempted to be in a snit,
    but on the other hand they had walked back the isle and then to me, which is more than 1km ;-)
    Then they recommended to switch it off before police would arrive on site
    but I replied that I'd only be afraid of that when fiddling with lasers...
    We then inspected the buildings around, paying great attention not to flash any traffic or pedestrians,
    and as police was not showing up anyway, we finally all went home.


    Great. But soon I was annoyed by having to fiddle with two batteries (and thus two volt warners),
    and the switch was a temporary solution, and the tube a bit shorter would be great,
    and how nice the handle might be, I didn't love it!
    I had misused a mortar (guess it's called like?),




    So I purchased another LiPo, 6S 8Ah,
    another charger, because I only had one for 4S batteries until then,
    yet another nicer handle
    a reasonable switch,







    and eventually the little green hideous looked like this!



    I admit, I do like warning signs, printed them myself and covered them with transparent tape,



    and they're even not a lie, due to both high ignition and working voltage, hot surface, and great brigthness.
    Ok, yes, I modified the laser symbol (horizontal line removed) because I like it more than the official brightness symbol.

    Perhaps a few more words about the bulb,



    specs
    . UHP (ultra high pressure), mercury vapour (instead of the automotive mercury metal halide type)
    . electrode gap 1.0mm
    . reflector about 60x53mm which corresponds to a circular shape of about 62mm diameter
    . power 120W
    . working voltage about 60V
    . 7000 lm -> ~58lm/W
    . light output typical (bundle lumen at 2.4m): 3200 lumen
    . working pressure ~200bar
    . colour temperature: CCT: 7600K, CRI: Ra 57

    killer features of these bulbs are
    - small electrode gap which allows for an astounding throw, given such a small reflector,
    - and very high pressure, which means broader spectral lines, and more red light
    which results in a nice neutral white despite the high color temperature

    It's an an Osram ballast and originally I had started with an Osram bulb, too.
    However, it was an elliptical type by accident and I ended up with a parabolic one from Philips.

    Thanks to Ot10St! who is responsible that I was able try such a build at all.

    Well, I'm so happy with the little green hideous
    (but gee, would it be nice to have access to 300+W ballasts, too? ;-)

    Thanks for watching and your time

  2. #2
    Flashaholic* get-lit's Avatar
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    Default Re: home made spot light 120W UHP

    Thanks for sharing. Great pics. These little lamps are wonderful. Hard to believe someone would be so close minded to call the cops over a light. Where I live you can get in trouble for wasting police time.
    I like big bulbs and I can not lie, you other brothers can't deny!

  3. #3
    Flashaholic* djans1397's Avatar
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    Default Re: home made spot light 120W UHP

    I applaud you on your homemade HID thrower! Pretty cool looking!
    For you were once darkness, but now you are light in the Lord. Live as children of light (Ephesians 5:8 NIV)

  4. #4
    Flashaholic* ma_sha1's Avatar
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    Default Re: home made spot light 120W UHP

    Welcome on board Sven m, did you purchase the German sewer pipe from Ot1st?
    Here are some pictures he posted on CPF a while ago.





    By the way, if you are in contact with him, please tell him to come back to CPF & check it out,
    he donated a 260W ballast to me a years ago, I finally finished my light with it. What a nice guy!
    http://www.candlepowerforums.com/vb/...260W-Short-Arc
    My Mods.. http://www.candlepowerforums.com/vb/...5&postcount=78
    Hobby only, I don't do custom mods as a service, thanks for understanding.

  5. #5
    Enlightened sven_m's Avatar
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    Default Re: home made spot light 120W UHP

    Quote Originally Posted by ma_sha1 View Post
    Welcome on board Sven m, did you purchase the German sewer pipe from Ot1st?
    thanks. hehe - no, pure coincidence. I already knew his 300W light, got the inner parts for mine,
    didn't really like grey or brown tubes from the hardware store,
    and then "found" my beloved green tube on a construction site (in a lattice box with clipping parts)!


    By the way, if you are in contact with him, please tell him to come back to CPF & check it out,
    he donated a 260W ballast to me a years ago, I finally finished my light with it. What a nice guy!
    True, true! No, unfortunately I haven't seen Ot10St for a while
    I saw his latest concept (in parts) at a get-together in autumn '11, [pics courtesy of elho]



    and I'm pretty tuned as well to see it finished.
    (And, yeah, hell of a bunch of nice projects you do have!)
    Last edited by sven_m; 05-08-2012 at 01:02 PM. Reason: added 2nd pic

  6. #6

    Default Re: home made spot light 120W UHP

    Can you give me a list of components to light a 250w UHP lamp?

    I'm trying to adapt a light source that I can mount inside a custom lamp house for my Vintage Bell & Howell projector.

    http://www.dailymotion.com/video/xq4...arc_shortfilms

    http://www.flickr.com/photos/10741951@N04/7076457021/

    Great work.

    Thanks







  7. #7
    Enlightened sven_m's Avatar
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    Default Re: home made spot light 120W UHP

    Hi ToeBoyMedia,

    I used the belonging vendor ballast for this lamp, and in fact the (UHP) ballast is by far the most expensive part.
    Sorry, I don't know how to home made it.

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