i purchased a set of 10 0603 smt led's from a reputable seller on ebay, phenoptix. however yesterday i gt my cousin (a qualified electrician) to solder them. they were difficult to solder but he did do it correctly. However none of the 4 we tested worked, should we bother testing out the rest or could it be that we just received a bad batch and should i just buy some bigger 3mm leds instead?