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Author Topic: How to reduce beam angle on washes  (Read 5751 times)

Rich Grisier

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How to reduce beam angle on washes
« on: February 26, 2016, 04:41:34 pm »

I have quite a few Blizzard Q12A washes that I use to light up the stage.  I use complementary colors, but still, colors wash together thus ending up in some off-white blend when the beam reaches the stage.  I'm thinking that a narrower beam angle on the washes would create more discernible color at the stage.  Are there beam "focusers" you can get for LED washes what would narrow the beam more?
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frank kayser

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Re: How to reduce beam angle on washes
« Reply #1 on: February 26, 2016, 05:25:43 pm »

I have quite a few Blizzard Q12A washes that I use to light up the stage.  I use complementary colors, but still, colors wash together thus ending up in some off-white blend when the beam reaches the stage.  I'm thinking that a narrower beam angle on the washes would create more discernible color at the stage.  Are there beam "focusers" you can get for LED washes what would narrow the beam more?


I can tell you barn doors don't work on multi-point lights.  I've had some luck using those honeycomb "filters" (for lack of a better word).
frank
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James Feenstra

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Re: How to reduce beam angle on washes
« Reply #2 on: February 28, 2016, 04:28:59 pm »

something like a top hat or egg crate may reduce the beam angle a bit (think at most 2-5 degrees), but looking to go from a 30 degree beam to a 5 degree beam is generally not possible
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Cailen Waddell

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Re: How to reduce beam angle on washes
« Reply #3 on: February 28, 2016, 05:53:55 pm »


something like a top hat or egg crate may reduce the beam angle a bit (think at most 2-5 degrees), but looking to go from a 30 degree beam to a 5 degree beam is generally not possible

There are actually lenses that do this.  The ADJ dots pars come to mind.  80 degree without lens. 5 degree or something with Lens

Good luck finding some though that aren't unit specific.  They may exist.  I'm just not sure. 


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Mark Cadwallader

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Re: How to reduce beam angle on washes
« Reply #4 on: February 28, 2016, 06:08:10 pm »

You might try to mechanically create a "shutter cut" by masking off a portion of lens at each emitter.  The traditional "donut" is a piece of black-wrap or Cinafoil (black extra heavy duty aluminum foil) that fits into the gel frame of a Leko-type light.

If you want to play with it, you would need to add a small strip of tape at the edge of each diode. Once you figure out where and how wide to make the mask, you could make a more permanent version from an aluminum pie plate (or maybe even cardboard). That would let you make several in advance, and attach them as needed. It would be a PITA, but if you have the time, it is cheap to try. Good luck.
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Mac Kerr

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Re: How to reduce beam angle on washes
« Reply #5 on: February 28, 2016, 06:19:22 pm »

The traditional "donut" is a piece of black-wrap or Cinafoil (black extra heavy duty aluminum foil) that fits into the gel frame of a Leko-type light.

A donut does not reduce the beam angle, it sharpens the edges of the shutters or gobo by masking the sides of the lens where light reflected inside the fixture shows up. It also reduces the total light output. Any method for reducing the beam angle that uses masking will reduce the light output. Wash light are just not designed to have narrow beams. Even on Lekos using shutters or an iris to get a smaller spot will produce less light on stage than a Leko with the right lens to produce the light you want.

Mac
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Cailen Waddell

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Re: How to reduce beam angle on washes
« Reply #6 on: February 28, 2016, 06:53:17 pm »

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Mark Cadwallader

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Re: How to reduce beam angle on washes
« Reply #7 on: February 28, 2016, 07:22:45 pm »

A donut does not reduce the beam angle, it sharpens the edges of the shutters or gobo by masking the sides of the lens where light reflected inside the fixture shows up. It also reduces the total light output. Any method for reducing the beam angle that uses masking will reduce the light output. Wash light are just not designed to have narrow beams. Even on Lekos using shutters or an iris to get a smaller spot will produce less light on stage than a Leko with the right lens to produce the light you want.

Mac

Agreed.  It was the best way I could think of to describe the work-around I was trying to offer as a suggestion to let the wrong tool for the job be less wrong.  (It is a sub-optimal suggestion, at best.)
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James Feenstra

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Re: How to reduce beam angle on washes
« Reply #8 on: February 29, 2016, 03:30:41 pm »

See here for some options

http://www.elationlighting.com/ProductDetails.aspx?ItemNumber=1705&MainId=1&Category=LED%20Lighting

these widen beam angle, not reduce it.

making a light wider is really easy....the opposite is not
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Cailen Waddell

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Re: How to reduce beam angle on washes
« Reply #9 on: February 29, 2016, 03:33:31 pm »


these widen beam angle, not reduce it.

making a light wider is really easy....the opposite is not

No they don't.  They do both.  It is a holographic material.  There is one that narrows. 

Again I'll refer to the adj dotz product that is 80 degree without the lens and 10 or 20 with it.


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ProSoundWeb Community

Re: How to reduce beam angle on washes
« Reply #9 on: February 29, 2016, 03:33:31 pm »


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