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Blacking out reflectors on ir torches....

Discussion in 'Night Vision Optics and Illumination' started by Alex.mc, Apr 16, 2014.

  1. Alex.mc

    Alex.mc Busy Member

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    What's the reason for that? Forgive my ignorance...... I'm just been wondering what the reasoning is for it? Is it because the light is shaped by an aspherical lens and therefore there's no need for a reflector? If so then my mind would think "why bother" but I doubt it's as simple as that?
     
  2. ratman60

    ratman60 Pro Poster

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    hello, terry 101 is the torch man and am sure he will say soon, ive no clue either:rolleyes: but have done all mine and put in aspheric glass too and it dont arrff work better :up:
     
  3. terry1001

    terry1001 Major Poster

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    If you have an as[heric lens fitted then you don't need the reflector except to hold all the parts in the right place. If the reflector is left shiny then it does what it was designed for and reflects some of the light which shows up as rings around the central beam, painting it matt black cuts this out and leaves you with a clean focussed beam. It works with all light, not just ir.
    If you want a wide spread of light then you don't need the lens. Focussing torches give you the best of both but will be a bit larger and heavier. The distance between the led and the back of the lens will affect the beam width, which is how the focussing torches work. With a torch like the 501b the lens is normally ok to give a decent beam but it may be necessary to cut down the reflector or space it out a bit if you want to get the tightest possible beam.
    With aspheric lenses it is better to have a small led as they are intended to focus a point source of light. All the leds produce a cone of light and only the light which falls on the lens can be focussed properly so larger lenses will perform better as long as the focal length doesn't increase too much - they need to be close to the led. Unfortunately larger lense are heavier and need taller mounts so don't suit every use.
     
  4. some bloke

    some bloke Busy Member

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    The above is very good info - but it also improves the shooters nite-eyes development as the night goes on. Every time a reflectored torch (visible light) is turned on, some of the spill is reflected back to your eyes off local foliage, moisture and dust in the air.

    That at least closes your iris's a bit but often also makes you perhaps subconsciously squint. the tighter beam has much less local reflection so your eyes remain better adjusted to the darkness. You will see better with and without torchlight once your eyes become accustomed to the darkness.
     
  5. ratman60

    ratman60 Pro Poster

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    hello,sorry forget to mention you as well, many members are helped so much from your advice including myself!!!!
     
  6. Alex.mc

    Alex.mc Busy Member

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    Right..... all becomes clearer now, if you'll pardon the pun!

    An aspheric lens seems the better way to produce a shaped beam of light, but I guess that the cost of manufacture of an aspheric lens is very much higher than a simple stamped and coated reflector, which is why they aren't seen much on torches?

    My Missus has an Audi which I have now just realised has aspheric lenses on the headlights!
     
  7. terry1001

    terry1001 Major Poster

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    It's not just cost although that would certainly be a consideration, you have to think about what most people want from a cheap torch. When you start trying to use them for something as specialised as night shooting a whole new lot of requirements come into being.
    An aspheric lens is quite simple and it works best with a very small light source if you wish to focus a tight beam, this is why the multi die ir emitters from ebay etc are not really well suited for use in a 501b with aspheric conversion. As with everything else you can get them in different qualities, one of the best for our uses seems to be the Ahorton version but this does need a replacement reflector/spacer - 'some bloke' does sell these for the 501b if you need to push the torch a bit further.
     

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