Quantity   Component name
1 × AL3050 LED Driver Current mode Boost-type LED driver 2.7-5.5V IN, 30V 40ma OUT with dimming control
1 × SRN8040TA Inductor (you can use lower current rating one if you like) 10 uH 4.6 A 33 mOhms inductor
8 × MP-3014-1100 LED 187 lumen/Watt 2.85V lighting LED
1 × 10 ohm 1% Resistor (I think) Gives 20ma out, see datasheet for calculation
2 × Any old capacitors