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    Combining red leds with very low powered 850nm - 880nm leds with eye safety in mind?

    Considering the danger with ir leds by themselves is that you can be looking at a bright light and not know it (while it is damaging your eyes all the same), would it be safe to combine low powered (eg. 3mm 20mA 2v) ir (850nm - 880nm) leds next to slightly higher powered (eg. 5mm 60mA) red leds...
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    Best cheap material for diy low power heating element

    I want to make a low voltage low power heat element, what would be a good material to use? I was thinking of something like aluminium foil but a bit thicker and able to be soldered. I want to make a track on a flat surface to make about 6 ohms for my first project.
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    Expected wavelength output of ceramic coated heat lamp?

    I can't find information on this type of heat lamp about their ir spectrum wavelength output. I assume it is mid or far infrared, but does anyone have a rough idea of the wavelength spectrum range in nanometres? This sort of thing
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    Running incandescent or halogen bulb with 2/3 or lower voltage possible?

    Can I drive a halogen or incandescent bulb with significantly lower voltage to achieve a lower colour temperature? I'm guessing I can with an incandescent but can I with a halogen, or will it not work properly?
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    Suitable material to filter UV out of halogen lamp

    What materials could be used to filter the UV light out of halogen light but pass all the lower wavelengths? Could salt work?
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    Material to filter ozone but pass ions?

    Is there a material I could put an ioniser inside of that would filter out any small amount of ozone but allow all the ions to pass?
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    Has anyone experienced different colour room lighting, if so which colour did you prefer?

    Has anyone experience being in a room lit with different colours (one at a time). If so which did you find best or was one good some time and another one at another time?
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    Possible to have safe low density infrared leds in board?

    Is it possible to have an array of very low power near infrared leds where each one is so low power and spaced out significantly so you cannot look at them all at once and it is safe for your eyes? Or is it still a bit risky?
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    Will a lightbulb inside a ceramic cube generate far infrared?

    Would an incandescent lightbulb put inside a cube made of ceramic tiles effectively generate far infrared heat? For instance if you paint the inside with heat tolerant black paint.
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    Why are halogen ovens more efficient than regular ovens?

    Is it because the wavelength(s) given off is more effective at heating the air? Or is there another reason? If so will any light wavelength light bulb be able to heat the air in a house to a greater degree than others? Or will it only make .00001% difference?
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    Is it possible to stimulate a tourmaline crystal to release ions or far infrared

    I read that tourmaline crystals can release ions and far infrared in response to heating and cooling (temperature changes) or mechanical compression. Would it also be stimulated by an electrical signal, or would that be almost useless with a whole crystal chunk? Is this a project that would be...
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    Salt lamps - what effect would the salt have on the light from incandescent bulb

    A salt lamp is a solid chunk of salt (with some minerals in it) with a hole drilled in the middle where an incandescent bulbs goes. So the light shines through quite a few cms of salt before leaving. The salt lamp appears to be a lower colour than the bulb would be by itself. What is actually...
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    Electro Magnetic field biological effects - AC vs DC, current vs voltage?

    When considering electro-magnetic fields emitted by very close heating devices (for example electric blankets/foot warmers etc. etc.) which type of power would produces the least harmful effects. What are the various biological effects (or possible effects) of voltage vs current and dc vs ac...
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    Best wall power supply for automotive 12v 1w ioniser module

    Power requirements: DC 12V Power use: <1W So if I need a 12v power supply with .083 amps. But I only have a plug pack that supplies 150mA, would I need a resistor? Since with plug packs the voltage starts off higher than 12v but goes down under load. It is designed to be used in a car with a...
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    Are there any dangers associated with ceramic coated reptile heating bulbs?

    Are there any dangers with ceramic coated reptile heating bulbs when placed overhead as a heat lamp? What is the exact frequency that the ceramic coating is converting the light into, is this a dangerous wavelength for your eyes? Does the fact that it is diffused over the whole ceramic coating...
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    Are deep red 660nm LEDS completely safe?

    Having learned about the dangers of IR leds even from a distance. I wanted to know if visible light deep red 660nm LEDs are completely safe?
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    Safe distance to look at a 950mn 5w Infrared LED from?

    Can someone give me a guide or make a estimation of what is a safe/unsafe distance to look at a 940nm 4.3w Infrared LED?
  18. V

    LED driver for my LED

    I am a newbie. I have an infrared led, this one http://www.ebay.com.au/itm/231097780060?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT I am trying to choose an led driver to power it with but I am slightly confused. The led is stated at 10w but has a forward voltage of 4-5v and...
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