Im not sure if I'd recommend heat lamps that made for reptiles to be used on birds. Its not that the heat is too strong, its just bad for bird eyes. The heat lamp will have to be 12-20" away from the birds cage, sometimes closer depending on how cold the room is, for the heat to really help the bird. And that is too close for the birds eye's comfort. There was a thread on this. Reptile heat bulbs and florescent lights vs avian. It was a very informative topic, I wish someone would have made it a sticky.
I'd only use heat lamps as an extreme emergency. Its sucks out all the moisture in the air (so do space heaters but the heat lamp will suck all the moisture out of the air right over the spot its directed). IMO not really safe for birds for a prolong use.
Thermoperches and space heaters work the best, IMO. I plan on getting more thermo perches in the future for all my fids.
Also since its near cold times, heaters will be on. I recommend a humidifier. It helps add moisture back into the air that the heat saps out.