Cut the Ultra Violet with lenses?

[Wylie]

Hi all,
I guess this may be a pretty basic question for some of you but I am at a loss for the answer myself. A question was brought up today concerning some LED headlamps and fishing. As far as I know fish and especially walleye are sensitive to ultra violet light.
Would it be possible to eliminate (thanks Nerd)the ultra violet specturms from LEDs with colored lenses? What color of lenses would eliminate the greatest amount of the ultra violet light from the white LEDs?
I'll take a guess and say that red would be the best colored lens to illiminate the ultra violet spectrum if this is possible because I know bear, dear and some other animals do not see the red spectrum.

 

[Deleted member 684]

Wylie, I think you mean eliminate instead of illiminate correct? You might want to try out camera len's UV filters. They come in different sizes from 49mm, 52mm, 55mm and some other sizes I can't remember at the moment. Might be a bit too big though.

 

[Beretta1526]

There are small UV filters for some of the smaller cameras. My Nikon Coolpix has a 28mm UV filter that would be suitable for some of the smaller handheld lights. there may be some in the 35mm and 40mm ranges for some of the Sony cameras.

 

[Wylie]

Thanks for the spelling correction Nerd. I HATE THE ENGLISH LANGUAGE!
I was basically looking for a cheap means of eliminating the ultra violet spectrums of light from whites LEDs. Some fish have phosphorus in their eyes and it makes them ultra sensitive to light and especially ultra violet light. The goal would be a simple colored plastic lens to eliminate the ultra violet spectrums if possible. Fancy coatings and stuff are probably not an option as I see it at this point.

And thank you too Beretta1526. You guys must have posted at about the same time or I am slow. Now that I have checked, I'm slow.

 

[shipinretech]

The best way to avoid UV spectrum emissions from white LEDs scaring fish away is to stop dynamiting fish at night. Second best is to switch to red LEDs for your continuous illumination light, and reserve white LED lighting for differentiating lures. A distant third is to put a filter over your existing lights.

If you can get away with just using a standard red LED, you will proabably be happier than dampening your white illumination. The red spectrum is the first light to get filtered out by water. The high power white LEDs that are commonly available are based on blue LEDs with a phosphor and are much more prone to penetrate through water filtration. By not emitting anything in a spectrum that penetrates, you should disturb the fish less. Red LEDs are best for this because they are designed to emit in a tight bandwidth that water should absorb readily.

I am opposed to wasting battery life; generating light only to throw it away on a filter bothers me. I am also not very fond of regulated solutions for the same reasons.

 

[Wylie]

But shipintertech you just can't beat dynamite, its the best bait I have ever found. /ubbthreads/images/graemlins/yellowlaugh.gif
I tend to look at this from the same direction you are and have mention a couple different colored LEDs in a headlamp to the owner of The Mad Dog Light Company. The answer was, I would rather not re-engineer a headlamp with different colored LEDs basically. /ubbthreads/images/graemlins/thumbsdown.gif I agree with you, why waste batteries and optimum output with a lens. Sometimes things really don't make sense to me but then we all have to roll with the punches sometimes don't we. /ubbthreads/images/graemlins/frown.gif
Thank you shipintertech.

 

[shipinretech]

People ask us why we make all of our products available in all colors available. At shows, we sort of look sheepish and say, "Because they can be?" Really, we do not object to why our customers want what our customers want; we can get the parts so we make the products.

I regret that we do not produce a headlamp-only product. Ours is not primarily a plastics house, so we do not have the capability of doing molded plastic easily. We can do plastics design, but it is not our first choice anymore. For right now, we are much happier working with circuit boards and machined aluminum. Our development time is next to nothing that way.

You can get headbands for Mini-MAG flashlights here:
http://www.arcade-electronics.com/cgi-bin/webc.exe/st_prod.html?p_prodid=20627&p_catid=233&sid=7@[email protected]

You can then carry one of our white LED adapters in a AA Mini-MAG for identifying lures on your belt and another red LED adapter on your head.

 

[binky]

Apparently, you can cut the UV entirely with a clear lens that has the right additives. It can be plastic. I dont' know yet where to buy some of that, but I'm curious.

What about for now just buying something like a pair of UVEX lab safety glasses that has UV protection (probably near $7) and cutting out a circle from a relatively flat portion of it?

It's been/being discussed over here, and the most useful paper states the following:

[ QUOTE ]
Optical properties. -- Both thermoplastics and thermosetting plastics may be highly transparent, opaque, or have any degree of clarity and light transmission in between. The total solar energy transmission may run as high as 90% with 92-93 in the visible region (400 to 750 nm).

Transmission in the visible, ultraviolet (UV) and infrared (IR) is a variable (depending on the wavelength) and can be controlled to a large extent by composition. Thus the UV transmission can be made high to achieve beneficial effects such as killing germs, or it may be cut off entirely by using UV absorbing additives to reduce deterioration of the plastic.

[/ QUOTE ]

 

[Wylie]

Thank you very much binky,
I think I am going to copy and paste this to an email and see what Mad Dog has to say now.

 

[Empath]

[ QUOTE ]
shipinretech said:
I regret that we do not produce a headlamp-only product.

[/ QUOTE ]

Well if you ever do, and need a name for it let me know. I've got the perfect name for a headlamp. I figure it'll get snatched up by someone sometime, but it's not trademarked yet. It's as natural for a headlight as the name "Cyclops", but Cyclops is already taken. /ubbthreads/images/graemlins/blush.gif

 

[INRETECH]

Most of the White LEDs use the Blue, and Deep Blue LEDs to excite the phospher - there shouldn't be any UV (<400) in the output

 

[Wylie]

Intertech,
Have you checked them for UV with a spectrometer? I am going to feel more than a little silly if I have been out to lunch on this thing.