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Interesting!
Our 'drip rate' is the same frequency as the building lighting. So I have
always assumed that people who are not sensitive to the lighting will not be
affected and that seems to be borne out.
----- Original Message -----
From: "David Smith" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, March 19, 2008 8:19 AM
Subject: Re: Strobe Drip
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> *****************************************************************************
>
> According to the Epilepsy Foundation:
>
> Even in predisposed individuals, many factors must combine to trigger the
> photosensitive reaction such as the frequency of the flash (that is, how
> quickly the light is flashing), its brightness, the contrast with
> background
> lighting, the distance between the viewer and the light source, the
> wavelength of the light, and whether a person's eyes are open or closed.
> The
> frequency or speed of flashing light that is most likely to cause seizures
> varies from person to person. Generally, flashing lights most likely to
> trigger seizures are between the frequency of 5 to 30 flashes per second
> (Hertz).
>
> http://www.epilepsyfoundation.org/answerplace/Medical/seizures/precipitants/photosensitivity/photosensitivity.cfm
>
> I interpret their information to mean that the risk is low, but is also
> very
> hard to completely eliminate since individual sensitivities are quite
> variable. I wonder if it would be possible to use timed sampling with a
> digital video cam to replace the strobe, but I suppose the video might
> flicker, leading to the same issues.
>
> Dave Smith
>
> On Tue, Mar 18, 2008 at 4:23 PM, Glen Moore <[log in to unmask]> wrote:
>
>> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
>> Incorporated, a worldwide network of science museums and related
>> institutions.
>>
>> *****************************************************************************
>>
>> Don
>>
>> We have had no reported problems - No complaints in 10 years of
>> operation.
>>
>> The strobing is fast - the pump is tied to the mains frequency - drip
>> frequency is 100Hz.
>>
>> Love the exhibit! It creates lost of discussion between visitors.
>>
>> Glen Moore
>> Science Centre and Planetarium
>> Wollongong, Australia
>>
>>
>> ----- Original Message -----
>> From: "Don Marvel" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Wednesday, March 19, 2008 6:40 AM
>> Subject: Strobe Drip
>>
>>
>> > ISEN-ASTC-L is a service of the Association of Science-Technology
>> Centers
>> > Incorporated, a worldwide network of science museums and related
>> institutions.
>> >
>>
>> ****************************************************************************
>> *
>> >
>> > Greetings,
>> >
>> > We're considering building a Strobe Drip exhibit, in which a steady
>> > drip
>> is
>> > optically captured by a strobe light so visitors can study the dynamics
>> of
>> > individual drops and experiment with strobe rate and phase
>> relationships.
>> > Aware of the potential hazard that strobes pose for people prone to
>> > seizures, we wonder what sort of experiences other museums have had
>> > with
>> > this sort of thing. We know we'll need to position the exhibit
>> carefully
>> > and provide a sign so that visitors are informed about the strobe
>> > before
>> > they encounter it. Have any of you had issues with this, and what is
>> the
>> > general feeling regarding risk (liability) vs. reward (visitor
>> experience)?
>> >
>> > Many thanks for your time and thoughts,
>> >
>> > Don Marvel
>> > Exhibits Director, WonderLab Museum of Science, Health and Technology
>> > 308 West 4th Street
>> > Bloomington, Indiana 47404
>> > # 812.337.1337 x22
>> > www.wonderlab.org
>> >
>> > ***********************************************************************
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>> Check out the latest case studies and reviews on ExhibitFiles at
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>
>
> --
> David L. Smith
> Da Vinci Science Center
> Allentown, PA
> http://www.davinci-center.org
>
> Please consider the environment before printing this email.
>
> ***********************************************************************
> For information about the Association of Science-Technology Centers and
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>
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