DisasterZone
New Member
Hi Guys
This might seem a bit of a strange idea but here goes. My wife has developed light-sensitive epilepsy. Fast flickering lights set her off. The worst seems to be the 100Hz flicker produced by old style, inductively balasted, flourescent lights and LED lamps.
I've started replacing all the lamps in the house with DC powered LEDs, which of course have no flicker at all (visible or otherwise). This has helped a lot indoors. Outside in the sun there's no problems at all.
There are some places she has to go, with the type of lighting that definitely affects her. So I had an idea:
The problem is caused by the 100Hz (or so) flicker caused by the lighting sytems. Add to this the lack of daylight (indoors without a window), and it's a recipe for disaster.
So, take a pair of glasses with built in LEDs. These LEDs provide a level of illumination into the eye that it generally more than the ambient light level in the areas in which she is affected.
The glasses have a light sensor on the front (LDR or Phototransistor etc). The light sensor controls the brightness of the LEDs in the glasses.
The idea is that the illumination level entering the eye is constant. As the ambient light level changes, the LED light level also changes inversely.
I we consider the flickering as a square wave (which it isn't), then the LEDs would illuminate to fill in the periods when the ambient light is off.
As the waveform of the flickering is quite complex, the idea would be that the flickering waveform would be reproduced inversely in the LEDs. As the ambient light gets brighter the LEDs get proportionally dimmer and vice-versa.
This idea is similar to noise cancelling headphones.
So the question is: does anyone have any ideas for a simple analogue circuit that might achieve the project above ?
Cheers
DisasterZone
This might seem a bit of a strange idea but here goes. My wife has developed light-sensitive epilepsy. Fast flickering lights set her off. The worst seems to be the 100Hz flicker produced by old style, inductively balasted, flourescent lights and LED lamps.
I've started replacing all the lamps in the house with DC powered LEDs, which of course have no flicker at all (visible or otherwise). This has helped a lot indoors. Outside in the sun there's no problems at all.
There are some places she has to go, with the type of lighting that definitely affects her. So I had an idea:
The problem is caused by the 100Hz (or so) flicker caused by the lighting sytems. Add to this the lack of daylight (indoors without a window), and it's a recipe for disaster.
So, take a pair of glasses with built in LEDs. These LEDs provide a level of illumination into the eye that it generally more than the ambient light level in the areas in which she is affected.
The glasses have a light sensor on the front (LDR or Phototransistor etc). The light sensor controls the brightness of the LEDs in the glasses.
The idea is that the illumination level entering the eye is constant. As the ambient light level changes, the LED light level also changes inversely.
I we consider the flickering as a square wave (which it isn't), then the LEDs would illuminate to fill in the periods when the ambient light is off.
As the waveform of the flickering is quite complex, the idea would be that the flickering waveform would be reproduced inversely in the LEDs. As the ambient light gets brighter the LEDs get proportionally dimmer and vice-versa.
This idea is similar to noise cancelling headphones.
So the question is: does anyone have any ideas for a simple analogue circuit that might achieve the project above ?
Cheers
DisasterZone
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