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Brighter than a Source Four

Discussion in 'Lighting and Electrics' started by jds10011, Jul 9, 2018.

  1. jds10011

    jds10011 Member

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    Anyone have any ideas for a fixture that is brighter than a Source Four with a 750W lamp? I have a 19 degree special that the director feels is not bright enough. I cannot supplement with an additional fixture because it is for a shadow effect and only one shadow is acceptable. I have "cheated" by swapping to a 14 degree barrel, but they're not happy with this solution. I have also tried the EDLT option but don't really see much difference in intensity. And yes, I have bench-focused the instrument.
     
  2. egilson1

    egilson1 Well-Known Member Premium Member

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  3. Amiers

    Amiers Lighting Phoenix 1 Lamp at a Time

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  4. soundman

    soundman Well-Known Member

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    Sure there are, any number of moving lights would be brighter or Robert Juliat makes this thing that is over twice as bright. What other fixtures do you have in stock? Is a hard edge necessary?

    If you have long life HPL lamps you could switch to normal ones for a bit more punch.
     
    Last edited: Jul 9, 2018
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  5. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    besides the 300 hr lamp in place of the 1500 hours - about a third more lumens - you might see if you can crank the voltage up a little. Check to see what it is at the plug with lamp at full. https://www.ushio.com/support/halogen-lamp-life-estimator/ Nice calculator. I cranked in the specs for the 300 hour lamp. with 110% rated voltage almost half again the lumens but life cut to 28%. I've got to guess this is least expensive way even if you go thorugh a few lamps.

    There are lots of installs where the fixture is not seeing near the 115 - so check that first.
     
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  6. JD

    JD Well-Known Member

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    Over-voltage will give you a much brighter light at a higher color temp, which will also aid in the perception of brightness. As Bill says, it radically reduces the lamp life, and you want to use a new lamp before you try it (an older lamp may simply fail.) One caution: How long is the effect run for? You would not want to damage the fixture as over-voltage=much hotter.
     
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  7. SteveB

    SteveB Well-Known Member

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    If they only want it brighter to look different or stand out from background, maybe a L218/L203 to cool it will do the trick. The volt it up solution is good as well and can be done at the dimmer CEM (if Sensor).

    If not your only choice would be an arc lamp mover and it would likely want to be a 1200w unit. Expensive solution.
     
  8. JohnD

    JohnD Well-Known Member Fight Leukemia

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    Just for giggles, I wonder if anyone has done a shootout with a S4 and one of those ancient behemoth 2000watt fixtures.
     
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  9. rphilip

    rphilip Active Member

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    Just thinking about how achieve an overvoltage like this. Would an adjustable autoformer work on a dimmer output?
     
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  10. BillConnerFASTC

    BillConnerFASTC Well-Known Member

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    I knew someone was going to ask. As I said, check the voltage now. The CEM can limit max volts out but it can't make volts. If this is now on a dimmer system and voltage at the fixture is already near input, then I think means of powering it outside the dimmer system is necessary. An autotransformer and a buck and boost transformer is one means. Or put together a little genset and use a dimmer to vonttol the speed. I dont know, would have to research and know more about the situation.
     
  11. danTt

    danTt Well-Known Member

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    A gam stickup or a mini10 might be better for shadow effects, depending on how much control you need on the rest of the beam. Otherwise, keep in mind that contrast is a huge contributor to percieved intensity--you might be able to make the shadow effect look brighter by dimming down the rest of the stage.
     
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  12. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    I've done some math, posted elsewhere. S4 wins every time.

    A long-defunct NYC rental shop had what they called a "BASH Booster." Perhaps @STEVETERRY can recall details.
     
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  13. SteveB

    SteveB Well-Known Member

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  14. STEVETERRY

    STEVETERRY Well-Known Member

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    This was a magnificent case of technical fraud. It was called "The Doubler" and rented/sold by Vanco Stage Lighting. It used a full wave rectifier to produce DC and then a capacitor that charged to a fraction of the peak value of the waveform, producing about 145V output. Of course, it was a clear case of TANSTAAFL (There Ain't No Such Thing As A Free Lunch). The lamp life was reduced to a fraction of the rated life--like 2%. I have attached a photo, and here is a link to the preposterous patent on the device:

    https://patents.google.com/patent/US4752719A/en?oq=4,752,719

    The product label also contains all sorts of safety, Listing, and code-compliance gems--take a read for your enjoyment. My favorite is "All Components UL Listed". It's astonishing that nobody went to jail.

    ST
    20180531_105420.jpg
     
    Last edited: Jul 9, 2018
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  15. STEVETERRY

    STEVETERRY Well-Known Member

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    That's how the Strong Trouperette III's on the Shubert Theatre FOH bridge for "A Chorus Line" were fed. At 130V from the autotransformer, they sure were bright, but there were frequent burnouts. The show used three spots, but there was a fourth spare on the bridge. When a burnout occurred, the operator would dive for the spare, without falling into the orchestra. It was 1975--what fall protection harness?

    ST
     
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  16. porkchop

    porkchop Well-Known Member

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    What are they willing to spend to make it brighter? I bet a VL4000 Spot is brighter. Or a followspot.
     
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  17. josh88

    josh88 Remarkably Tired. Premium Member Fight Leukemia

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    I have a crazy idea that in skimming this I dont think I saw..... Can you dim the rest of the stage? It wouldn't take a lot, maybe thats an option? drop the rest 10-20% and see what happens. With where you're at the other options seem to be a mover or follow spot.
     
  18. ship

    ship Senior Team Emeritus Premium Member

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    Assuming not loing life lamps in use. I would CTB 1,4 and 1/2 try in fooling the eye.
     
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  19. JD

    JD Well-Known Member

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    Have to wonder what the lamp arc-out on was like on filtered DC. I suspect more than one lamp base and socket turned into a mini-super trouper!
     
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  20. FMEng

    FMEng Well-Known Member Fight Leukemia

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    In English?
     
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