Leds Lighting Product Development
I am looking for an expert for leds in a flashlight. The led needs to be a 1/2 watt or 1 watt, and about 3.5 volts (could be higher voltage) and put out the brightest light with the lowest power usage, since i am using a super capacitor for the energy source.+15 Other Responses
Our team is pursuing an in-depth research on led market (led display, led lighting, led signs and led chips) across 30 major countries. i am looking at supply and demand of the product categories and its subcategories, leading players in each country, leading products in each country and much more. We are in the process of reviewing the industry experts.+12 Other Responses
Matching led and phototransistor for custom interruptible optocoupler
i am designing a product with a "rotary table" of sorts that needs very precise "detents" in two rotation positions 180-degrees apart. These positions must be repeatable to 0.001" == 0.025mm or better. After considering various kinds of mechanical detents, i decided that perhaps i should adopt a sort of "optical detent" for these two positions.
The obvious approach would be an interruptable optocoupler. Unfortunately, they all seem to have very wide apertures... The smallest i found was 0.150mm and i need something 10 times smaller than that.
So i assume i'll need to make one myself out of discrete led and photosensor that pass very close to each other (say 0.025mm ~ 0.050mm) and have ~0.015mm wide vertical slits on both so the sensor doesn't see the emitter unless they are exactly lined up.
I've found some pretty nice, bright, narrow viewing angle red leds, but then when i looked for sensors, i found they all seem to be ir detectors either at 8200a to 8600a or around 9200a ~ 9500a... Which the red leds do not emit.
So the question is this. Where do i find narrow viewing angle phototransistors that are highly sensitive at ~6300a to combine with the bright narrow angle red leds i found... Or... Where do i find bright narrow angle infrared leds to combine with these ir phototransistors?
I assume i'm going to need very bright, very narrow angle leds to get enough light through those narrow slits to trigger the phototransistors. The system does not require high speed performance - the rotary table does not rotate very fast at all... About 1 revolution in 10 seconds.+2 Other Responses