I'd like to string together 10 of these Cree LEDs in a series circuit (Vf: 3.0v, Imax: 0.3A): http://www.cree.com/LED-Components-and-Modules/Products/XLamp/Discrete-Directional/XLamp-XQA
I think this constant current driver should be suitable given it can output up to 35v @ 0.3A: http://uk.rs-online.com/web/p/led-drivers/7063213/
I've done a fair bit of research but my only electrical knowledge dates back to my school days so I'm hoping someone can advise as to whether this really is a suitable driver?
Also if I were to increase the number of LEDs to 12 (requiring a total of 36v) would the LEDs function as normal but the last one appear dimmer?
Lastly, I'm unsure if I should add a dropping resistor at the start of the circuit, and if so is the following calculation (for 10 LEDs) correct?
R = (Vs - Vf) / I R = (30 - 3) / 0.3 R = 90 ohms *seems very low!*
Please assume minimal knowledge (but a desire to learn)!