How long does it take to cycle through the colours?
Mar 29th, 2011
Answer - It takes about 45 seconds.
Mar 27th, 2013
Do you a supply a board or wire which these LEDs can be connected into? I am looking at using a 100 of these in 10 x 10 rows and the either have them plugged in to mains (with a resistor, if you can supply) .
As this requires 5v - would I still need a resistor if I used a 9v battery? If so, what resistor would you recommend please.
Jun 18th, 2013
The LED needs to run off 5V, you are best using a 5V regulator to achieve this as you will always get 5V irrespective of the current consumption of the LED.
The LED works by turning on different amounts of red, green & blue LEDs therefore to get red just the red LED is on to get purple the red and blue LED are on. This means that the current consumption of the LED when purple will be twice the current or the red as twice as many colours are on. The way you would normally work out the current limit resistor is to look at how much current the LED takes and the voltage that would drop across the resistor, the issue is that whilst there would be 4V over the resistor the current is variable. This means that you can’t work out what the value of the resistor using theory. If it is possible to keep the voltage on the LED in specification across the full colour range then you may be able to drop the voltage using a resistor however I couldn’t guarantee that it would work or recommend the resistor value.