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hi i would like to know some things about electromagnets. when you make an electromagnet do you need to ad something like a light bulb to wast energy to make a magnetic field? can you make a stronger field with pulsed power then constant power, by stronger i dont mean bigger but denser? thanks
wow thanks. they are the wavelength im looking for, but look really expensive. i just found an led that might work but im not sure if i should believe them that it dose what they say it dose. here take a look...
thanks. what im trying to do is take an led that 450 nm and has a range of 440 to 460 nm and make is so the peak is 440 nm. i have not found a led that has a peak of 440 nm if you find one like that it will solve my problem. also i am willing to go as far as to use liquid N2 to change the...
hello all this is my first post. i want to know is there a way to change the wavelength of an led with in the range of the led by ajesting the voltage, temp or something like that. thanks
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