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Strobe Light warning in program?

Printed From: Community Theater Green Room
Category: Producing Theater
Forum Name: Lights and Sound
Forum Discription: Technical discussion
URL: http://www.communitytheater.org/forum/forum_posts.asp?TID=3555
Printed Date: 12/12/24 at 12:27pm
Software Version: Web Wiz Forums 8.05 - http://www.webwizforums.com


Topic: Strobe Light warning in program?
Posted By: Mr. Lowell
Subject: Strobe Light warning in program?
Date Posted: 10/23/08 at 8:51pm
Have any of you had to print a warning about the use of strobe lights in the program? And if so, how was it worded?   

Thanks, Dana

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Mr. Lowell,
Lighting/Set Designer & Tech Director,
for the Linda Sloan Theatre,
in the Davison Center for the Arts,
at Greensboro Day School



Replies:
Posted By: JoeMc
Date Posted: 10/24/08 at 12:10pm
Not that we use strobes that much, but each time we do, we ensure there is a warning notice in the programme & notices on all entrances & in the Box Office.
"Strobe lighting effects will be used during this performance. Patrons that may suffer from epilepsy & other visual light stimulation   effects. Are advised to contact the Front of house  staff, prior to entering the auditorium!"
In a lot of instances punters who are pre warned, can take appropriate action to reduce the possibility of a seizure.
However it is not only Strobe lighting, but other types such as coloured stripes & moving  patterns can be a problem.
I have a particular problem with mercury vapour lighting, as I have survived 5 strokes thus far.
If I'm forewarned I can look away & cover my eyes or in extreme cases, use sunglasses, which help.
 
Seizures can be provoked by intermittent light and by patterns, most notably of stripes, whether flickering or steadily illuminated, static or moving. Sensitivity is usually, but not invariably, maximal at flicker rates of 20 Hz, and the majority of patients are sensitive within a flicker frequency range of 850 Hz. The range of sensitivity can be greater: occasionally patients are sensitive to isolated flashes or to flicker that is so rapid as to be almost imperceptible. The patterns to which patients are most sensitive are spatially periodic: one cycle of the pattern subtending about one third of a degree at the eye (spatial frequency, 3 cycles per degree). If the pattern drifts continuously in one direction, very few patients are sensitive, but if the pattern moves with a similar retinal velocity, repeatedly alternating its direction of motion, the susceptibility can be as high as that for flicker, with similar frequency dependence as regards the temporal periodicity. Overall, sensitivity to visual stimuli increases with the total amount of retina and thus visual cortex being stimulated.


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[western] Gondawandaland
"Hear the light & see the sound!
TOI TOI CHOOKAS
{may you always play to a full house!}


Posted By: pdavis69
Date Posted: 10/24/08 at 3:26pm
We will put a warning on our lobby doors for strobes, gunshots and adult language.

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Patrick L. Davis
Fort Findlay Playhouse


Posted By: Debflo
Date Posted: 10/24/08 at 6:56pm
I agree with those above me - always put a warning up. For Strobe lights and gun shots.

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Check out The Denver Theatre Examiner! http://www.examiner.com/x-474-Denver-Theater-Examiner


Posted By: tech_director
Date Posted: 11/15/08 at 9:05pm

We put warnings in the program, outside all the doors and it is mentioned in the pre-show recorded announcements.

We always word ours as "There will be strobe lights used during this production."


Posted By: Mr. Lowell
Date Posted: 12/15/08 at 12:43pm

Followup:

I had absolutely no complaints about the strobe during the run.  (Although it was aimed upstage and only used for about 10 seconds).  On the inside page of our "Les Mis" program our director printed the following notice:  "Please be aware that theatrical smoke, live gunshots and a strobe light are used in this production."



-------------
Mr. Lowell,
Lighting/Set Designer & Tech Director,
for the Linda Sloan Theatre,
in the Davison Center for the Arts,
at Greensboro Day School


Posted By: Lima
Date Posted: 12/24/08 at 11:54am
We always post strobe-light warnings in our programs, because we like to strobe in the audience's faces occasionally (you know, strobing intels that rotate and flare out before going off), two times I remember are from when we did Beauty and the Beast and also Les Mis. They create a nice sense of chaos.

Especially because two of our techies have epilepsy (one induced by strobing lights), we're really careful about warning the audience.

We also warn for hazers, just so we're completely free of liability.

(Our TD comes from a magic show/Vegas/DJ background, so we do a lot with strobes and hazers/fazers/fog machines.)







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