Recent content by haserman

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    High power thru-hole LED

    i got the same result you did with my very bright flashlight. that's just the underside of the eye socket, not the eyeball itself. though i was able to see "light" in my eyes in a dark room when i put the flashlight in my mouth and aimed at its roof. just didn't see light coming out of my...
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    Far Infrared LED possible?

    thanks! i will look into that. this is very useful stuff, btw, thanks much again. PAR64, no rippled front glass. i've tried using smoothly rolled Al foil, extended out like an antenna and throwing the light out through the aperture on the other end. the heat _does_ travel that far, but not...
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    High power thru-hole LED

    oh, man. this i gotta see. i tried, but i'm not able to get my eyes glowing from the inside. what power light and where did you point it? it would be awesome for halloween.
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    Far Infrared LED possible?

    thanks for the detailed reply, Benson. i am aware of a good part of that already. perhaps you can make sense of what i don't knows: GOALS: ------ 1. throw a hand-sized area of IR at 15-20 feet that can be **sensed** as heat using little energy. 2. i am only interested in energy thrown at a...
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    High power thru-hole LED

    i saw the area under my eye _sockets_ glow when i put a bright flashlight in my mouth. how do you get the eye to glow when the whole purpose of the sclera et al is to retain a black environment?
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    Far Infrared LED possible?

    sorry to put this one here again -- i haven't figured how to default to "send me notifications by email, so i'm just making that explicit.
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    Far Infrared LED possible?

    do you sense the IR output as heat (*not* the heat generated at the device, but by absorption of the emitted IR)? thanks!
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    LED heat vs INCAN heat

    EricB, it is probably a bit of both. the LED will generate a certain amount of heat as a byproduct of the light it generates. the changing of the source voltage to something appropriate for the LED probably also contributes some of the heat. My guess is that the former is the large part of the...
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    LED heat vs INCAN heat

    yes, bshanahan14rulzis correct. see my replies elsewhere in this thread.
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    LED heat vs INCAN heat

    not exactly. different wavelengths have different absorption and reflection. this is NOT a linear function of wavelength, i.e. there are peaks at certain wavelengths. this depends on the absorption by the epidermis, the dermis, fat, water and blood. it appears to be a fairly complex subject...
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    LED heat vs INCAN heat

    to clarify, LEDs need to operate cool. if they are high power LEDs, this means that you'll need to attach a heatsink (a piece of metal, thermally bonded) to the LED. if it gets too hot, it will burn out. in contrast, an incandescent light is designed to operate hot. it does not need a...
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    Osram Ostar 6 Die radiates heat

    there is a difference, though. not every wavelength is _felt_ as heat. 850nm to 1000nm is apparently a good range for it. this is because some of it is absorbed shortly after it enters the skin, which is where the thermoreceptors are. i've also read that this band of IR (IR-A) is also highly...
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    LED heat vs INCAN heat

    here's a bit more on heating the body (which is what i want to do) that i got from an expert in the field. it is a bit off-topic from the original question, but should serve to further illuminate (haha) the physiological effects of infrared radiation. [heating the body] is constrained...
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