I have seen many Golstons form different vendors. The drives and LEDs are signficantly different.
As far as finding resistors, any good local electronic supplies should have it; check yellow pages. I have used 1.9 ohm for the 3.0 v batteries. The 3.2 sounds correct for the 3.6v off the top of my head. I usually get a pack of 5-10 5% resistors for about $2,
The 1 ohm resistor is for primary 3.0 volt batteries, 3.0 v rechargeables have enough of a higher initial voltage off the charger to blow the lights with the 1 ohm resistors. I had changed quite a few of those for several people that got the early models from me.
The best and brightest 7W now come from DAE and his two sites, qualitychinagoods and szwholesale. I have no experience with fifthunit or their product, maybe it is the same.
It appears that the newer style lights that DAE has have a narrower beam, and therefore a higher lux reading in the center. One vendor on a thread reported that the old 7w, still at DAE's sites, put out more light over all than those 12w purported K2s. DAE's beam shots support that observation. It may have been an accident of fate but the reflector does a very efficient job on these 7w, the geometry of the the LED, its output and reflector are a good match. Although there were only two sites that said the 7w had a 200 lumen output you can compare them with lights of known LED out put. Most only rate total lumens not actual output, bulb-lumens. So a even though there is no theoretical way those lights can put out 160-200 lumens the high efficiency can account for them comparing to a light with a 200 lumen source and lower output efficiency. And they compare well. They are as bright to brighter compared to more than one Nuwai TM-800x3 on position 2, 160-180 lumens, with as high as 4.8V power supply.
