Things going on inside PAR & Automotive Tungsten-Halogen Lamps.
Properties of Tungsten at 500 & 2,000 K :
Radiated power density, 97.1 & 240,000 watts/m^2
Resistivity, 1.056e-7 ohm-meters & 5.667e-7 ohm-meters
Electron emission, nil & 10.0 amperes/meter^2
Electron Affinity of Neutral Bromine & Iodine Molecules and Atoms
Br2, 2.55 eV
Br, 3.36 eV
I2, 2.55 eV
I 3.06 eV
Bond Energies:
Br - Br 2.00 eV
Br - W 3.42 eV
I - I 1.53 eV
I - W ~ 2.30 eV
Br - Al 4.6 eV
I - Al 3.8 eV
