This video is a demonstration of Difference between flat surface heating and frame heating with Halogen Point Heater.
Please check the following site for more information.
Related page:
Verification of rereflection heating method-Difference between flat surface heating and groove heating 
Verification of rereflection heating method-difference in irradiation angle 
6-4.High temperature heating method – Frame heating 
Heating of wire solder by the Halogen Point Heater HPH-35 
The difference by the color of the polypropylene heating with a halogen line heaterHLH-60A/f∞ 
6-1.About the high-temperature heating method 
Heating of zinc alloy decorative metal 
Temperature rising time of HPH-12/f6/12V-20W