Filippo, be careful with the NTC's. They have their place, but it is important to understand how they work.
From this PDF datasheet on that model that SafetyBob mentions, you can see it looks great with a nice low 27mΩ when fully heated. However, to go from the starting resistance of 1,000 mΩ (=1 Ω) @ 25 °C (77 °F), you need to pump 10A through the NTC, raising its temp to 182 °C (360 °F), before its resistance drops to 27mΩ...which is hot enough to roast a turkey.
If you only pump 5A (50% of NTC Max Rating) through the NTC, then its resistance will drop to 60 mΩ. Since the 1185 only uses 3.5A, the resistance will be much higher the closer you get to its resting 1,000 mΩ.
Also, keep in mind that the resistance of the NTC is affected by ambient heat. If you measure the resistance of the device all by itself, it changes in direct relationship to its physically influenced temperature. I think (from memory) that resting resistance went up to 6 Ω when I put it in the freezer.
So using an NTC hotwire in the winter will be affected by the cold, and all these resistance readings affect the current/voltage delivered to the bulb. This all underscores how handy AWR's regulated, soft-starting Hotdriver was to have....and how much of a difference AW's upcoming regulated "pre-set" voltage driver will be. It was mostly used with the 5761 bulb, which falls into the 5A category. Some of us have also found that at its 50% rating it did not seem to be dropping down to 60 mΩ as we planned. There is a variation in quality control that can be quite striking from predicted values on a random basis.
