Justin98TransAm said:
So you're sayin' to accomplish this I'd need to buy specific LED for the job?
You get what you pay for. Phone the manufacturer for a
real datasheet with details and curves and stuff. Do they even have a phone? :shock:
As I suspected, to be bright they are focused to an extremely narrow angle that varies 50% for each one. You must stand directly in front of them and adjust each one to shine on you like a spotlight. A little to the side and you'll hardly see them.
For multiplexing circuits, who knows at what current they will pop. :lol:
Did you test them? I bought a bag of cheap Chinese LEDs and only half of them worked. :cry:
where would I get the proper type of led?
I buy Agilent LEDs from Newarkinone and Digikey. They have wide angle precision optics, epoxy instead of cheap plastic and UV inhibitors for long life in the sunshine. Their datasheets and tips on their use are very detailed. They work extremely well on pixel screens and in traffic lights.
I have used them for many years and their brightness selection increases and their prices drop almost weekly. :lol:
what would be required to drive them?
There is a new forum about LED signs. One guy posted his circuit that uses a pic to drive the rows and TIP42 power transistors to drive the columns. He multiplexes only about 8 columns for each group so that the duty-cycle isn't too low. His schematic is a fuzzy Jpg hand-drawn sketch that is hard to see, but you can join the forum and ask him and others, maybe me. :lol: I'm all over the web!
**broken link removed**