I am making a LED cube (5x5x5) and I'm using some 5mm yellow LEDs with clear body. I have a feeling they are 15Degree 20ma, but they were given to me so I'm using them in my prototype even though they are a bit dim. FREE is good! :)
For my final version, which LED should I get?? There are so many and the specs seem a bit confusing. The mcd ratings seem to vary from single digits to over 10,000. Also, does the mcd depend on the rated viewing angle? I'm thinking I need something that is either diffuse or at least 60deg angle to make it visible from various angles and not have the lower LED shining up the bleep of the one above it. I also don't want to go over 20ma to be powered off the Arduino's USB, also 10c (or less) would be a good pricepoint. If a higher powered LED is better, I could probably power the project LEDs from an external source, but at the moment I'm just using the USB power.
I'm multiplexing the 25 risers of 5 LEDs each so 5x20ma=100ma would be within the Arduino capabilities.