This video is a demonstration to Heating control of the wood emits smoke with a halogen line heater HLH-30A/f20.
Please check the following site for more information.
Related page:
Wood heating with halogen line heater 
Branding and Stencil of wood 
Partial heating on a piece of wood-star-shaped ★ 
Proven by heating paper : Emissivity difference by color 
Heating of wood series 1 – Spruce 
Heating of wood series 4 – Paulownia 
Heating of wood series 5 – Agathis 
Heating of wood series 3 – Japanese cypress