I need to make a Bat Signal

No time to explain.

Please include details instructions and/or pictures.

Thanks.

If your looking for a light to hit clouds, you’ll need a beastly hid and a bat imprint that is not translucent, and won’t melt.

If its for 200 meters, and shot onto a wall a block or two away, you could consider LED. If you want a small batsignal thrown a fair distance, an aspheric lens may help.

Need more info.

You want one exactly like the movies. Take a good look at the movie, giant searchlight which probably isn’t cheap :wink:

Also if you want to cloud bounce, it’ll depend where you live. Most likely short-arc I’d say.

Actually, not all that expensive (a few thou). The biggest problem is finding one where the reflector is still in good shape. Most of them corroded and pitted long ago, reducing the output by a bunch.

A few thousand? :frowning: that’s not budget. Where’s Ma_Sha when you need him :wink:

You mean an ultra sound device for repelling bats? Im looking for something cheap that would do this too :smiley:

The bigger problem is that the bat signal shown in the movies won’t even work… You could use a bare LED without reflector as an approximate point source (simple but not at all throwy), or you need a projecting lens in front of the bat sign.

i don’t think a bat signal can be done with a reflector light.
try this. turn on one of your flashlight, put a finger across the lens, and you can still see the hotspot on the wall. so if u replace your finger with a bat shape paper or something, the hotspot would still show up.
but i think it can be done with a point source light. i just took off the reflector of one of my lights and i can do a finger puppet light show on the wall.

so i think what u need to do is to take off the reflector of one of your light and mount a bat shape cardboard in front of it.

edit: looks like Dr. Jones beats me to it.

I thought of this more than once. It would be awesome to have a led which die has a bat shape, so you can just project it with an aspheric lenses.

I wonder if it is possible to take one of these huge (and expensive) leds, and crop the shape of a bat

Use a laser with beam expander bah…. Cheaper than short arcs (which wouldn’t work anyway LOL!). You’d still need ultra low clouds of max 200m (maybe you can go on top of a hill, be careful of lightning bro).

Here’s a star signal.

Oh….actually can just use any focusable laser pointer, what you want to do is to make the point source have a wide divergence (eg 30 deg beam). Put a ~ 4X 75mm diameter magnifying glass that you can get from ebay, focus it nicely so that you have a big spot in the distance. Cut a batgirl/wonder woman/ironman sign and place it on the magnifying sign, You could get those 8-12 dollars tripod support from O-like.com or ebay.

In essence you can use any 405/445/638nm as a source. This one would be the most visible but limited to about 120s of gunning. If you want max length run duration, get those bigger 445nm nearly 3W lasers, but wait….your eyes can’t focus on blue light properly over a big distance…so strike that out. :frowning:

Something like this (of coz in this vid they want it to be focused as small as possible at a huge distance…sort of).

Additional fun

I finally sold the moon blaster, pretty cheap, but I am pretty sure you won’t see another true16 million candle power light in that price range. but it won’t do bat wing.

My son has a $3 flashlight that could do batwing on the wall, it’s just a sticker on the lens, the light has no reflector IIRC.

How much did the moonblaster finally go for?

http://www.google.se/search?hl=sv&q=batman+flashlight&bav=on.2,or.r_gc.r_pw.r_qf.&biw=968&bih=470&wrapid=tlif134876207717410&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=7nlkUM6-DfHQ4QThu4CACw

I’m thinking that a thin sheet of plastic with a tiny bat logo cut into it placed right on top of a CBT-90 in an aspheric setup would give you what you’re looking for. Just make sure that the aspheric is focused to the plastic piece.

OK, what I’d really like to do is be able to project a bat signal type image ( a silhouette image) onto walls or buildings from a distance of 100-200 yards.

I’ve putzed around with some small piece of clear plastic behind the lens, but no success yet.

What ya need is a large 4meter Rokkaku or Genki and paint a bat sign on it.Some quality braided line[1000ft] and a proper thrower like a TN31.A decent 10mph wind and a ground stake/anchor

Rokkaku
http://www.google.co.uk/search?q=rokkaku+kite&hl=en&rlz=1T4SMSN_enGB425GB425&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=Tq5kUKzsBIqw0QXC8oHIAg&ved=0CCsQsAQ&biw=1249&bih=586

A few ideas below

http://www.google.co.uk/search?q=kites+with+lights&hl=en&rlz=1T4SMSN_enGB425GB425&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=TLRkUJ_5Cueb1AWk5oCwAg&ved=0CEkQsAQ&biw=1249&bih=586

Im doing a similar thing in the uk for children in nead.Have done on many occasions over the years

DON…

Maybe try calling 911?

Haha I was just watching batman when I saw the post.

Maybe with quite a few leds and aspheric lenses giving the bat shape it could work, something like 30 Sipiks…

I have played with LED array chips and aspheric lenses. They will project an array of dots. A mask over the array might make a passable bat signal. You will probably need a metal mask. Paper will burn, plastic will melt. Also, you will probably need to space it away from the array to prevent heat from backing up onto the array.

But, avoid those Chinese arrays. They are rather awful and have a bad case of Chinese Lumen Syndrome. Buy a decent Bridgelux array (Digikey and Newark carry them). You can pump 150 watts into their biggest one and get 15,000 lumens out (beware of the cooling requirements)