LED's, Resistors, and a 74HC595

Other Hardware LEDs and Multiplexing
1

My project will control LEDs that are connected to a 74HC595, very similar to what's described here: https://www.arduino.cc/en/Tutorial/Foundations/ShiftOut
The article says to use 470 ohm resistors. My arduino kit has a bunch of resistors but the closest are 220 ohm and 1K ohm resistors. Which means I'd need to buy resistors just for this project. Here's where i'm wondering if there is another option.

For my project, I'll need to run about 5-7 inches of wiring between the 74HC595 so I figured why not buy LED's with built-in resistors and that already have the cabling. That got me looking at these:

They are 12v LED's with built-in resistors.

And here's my question. (Might I add that I started this project a year ago and only now have time to complete it so I've forgotten a lot of what I learned). My question: Can I use these 12V LEDs even if I'm only running them via my 5V arduino setup? Would I be under-powering them?

2

Use the 1K resistors. The LEDs will be slightly dimmer but easily visible

3

The only thing that makes them 12V LEDs is the value of their current limit resistors. The resistors appear to be 560Ω (for white). If that is the case, at 5V the same LED will draw about 6mA. They will be dimmer, but by how much it is hard to say.