Sunday, March 26, 2006

how long do lights in costumes last?

part of my series of commonly asked questions and answers:

Q: What is the life of these lights? How many hours do these costumes last? If one light burns out, does the whole thing go out? Is it easy to replace a light?

A: With the proper care, many of my clients continue to enjoy their lighted costumes for several years. The LED lights themselves do not burn out like regular incandescent light bulbs (the type used in xmas tree lights, for example), and the connections are permanent, rather than replaceable. LEDs have a life expectancy of 100,000 to 300,000 hours, which is much longer than needed for a typical piece of clothing. If you used it 10 hours a day, every day, that would still be less than 4,000 hours of use in a year.
The durability of flexible electronics continues to improve, but they are still more fragile than the types of electronics that are protected by plastic boxes. The LEDs are vulnerable to excessive forces (they can be crushed), and while they do resist some moisture, they can become corroded after repeated exposure to sweat and/or washing. When a light does go out, it is most likely due to a mechanical failure, such as a broken/corroded LED lead or a broken wire. We try to find the right balance between making the wire connections as robust as possible, but without being too bulky, so that the fabric parts and electronic parts will have about the same lifetime.
The circuits are designed to be redundant, so that one breakage will not make the whole outfit go dark, unless that wire happens to be part of the power supply or the on/off switch.
The lights are not intended to be replaced by the end user, but if they are damaged somehow, they are usually repairable (if you can send the garment back to us).
The lifetime of EL wire is an entirely different story --- the half life of the glowing phosphor material in the wire (the time until the brightness fades by half) is typically between 3000 and 5000 hours of active glowing time. This is fine for many applications, but is something to consider if you need your garment to be lit for a particularly long time.

Tuesday, March 14, 2006

my scrolling message bra

A few gadget blogs and tech news sites have recently commented on my "mixed messages" bra. (thanks!) Yes, it's an unusual performance art piece, designed to confuse/amuse people who will tend to look at lights (and breasts), only to discover that the text of the message literally says "DO NOT LOOK". It's not intended to be particularly practical or serious.

Here's the page in my site: http://www.enlighted.com/pages/messagebras.shtml

I'd like to clarify a few things, for those who are curious:
- This was designed and built by a woman (me)
- I consider myself to be a feminist
- I recognize that some people are offended by the idea of drawing attention to bras, breasts, and women's bodies in general, but I think it's more disturbing to say that those things must be concealed, or that the woman herself has no voice in the matter
- Depending on the situation, it can be quite empowering to wear a lighted bra in public (with or without messages)
- This particular bra is more of a social experiment than a product, and I don't expect many people to actually want one

Here's an example of the kind of response I've gotten (from a guy) while wearing it:
Q. "Did you buy that, or did someone make it for you?"
A. "I made it."
Q. "Oh, but who built the electronics?"
A. "I did."
Q. "Oh, then who wrote the code?"

Yes, seeing how people react to this stuff can be quite enlightening.

Monday, March 13, 2006

where to buy lighting supplies

I know, this is long overdue, but I've been *busy*busy*busy*! Here are some common questions and answers:

Q. Where do you get the lights?
For most of my designs, I use LEDs, which come in a variety of shapes and sizes. LEDs with metal leads are intended to be mounted "thru-hole" style on a circuit board, although I typically use the leads to mount them in fabric. The most common thru-hole types are known as T1-3/4 (5 mm diameter) and T1 (3 mm diameter). The same light-emitting chip that is embedded within a thru-hole LED is also available in smaller "surface mount" packages. These are better suited for some applications due to their smaller size, but they are more difficult to connect to a circuit, and are not recommended for beginners.

You can get thru-hole LEDs from any electronics supplier, and I use a variety of sources, depending on the type of LED and the quantity. Here are some suggestions:
Local walk-in options: Radio Shack, Fry's, other electronics stores
Online electronics retailers: http://mouser.com/ ,
http://www.digikey.com/
Online surplus: http://www.allelectronics.com/ ,
http://www.goldmine-elec.com
Online LED specialists: http://www.theledlight.com/ ,
http://www.lsdiodes.com/shop/

I also use EL wire and EL flat panel materials in some of my designs. These are available from some of the same electronics suppliers, although you will find the best selection of EL wire and drivers from a specialty dealer such as
http://coolneon.com/ or
http://www.coolightwest.com/

I mention these sites because this is the most common question I am asked (and not because I'm trying to advertise for any particular vendor).