SPOT AND LINEAR FRESNEL LENSES
Both can be used for solar cooking and solar hot water heating.
There are two basic types of Fresnel lenses, Linear and Spot. Both lenses look identical to the naked eye in terms of the circular Fresnel pattern but a Spot lens will always appear more transparent. Spot lenses produce a very small tight beam at optimal focal length and are generally more powerful size for size. Linear lenses produce a long flat beam ranging from 1 inch high by 3 inches wide up to 1" x 12".

Linear Fresnel Lens Advantages:
• Less chance of damaging equipment if liquid evaporates
• Long beam can be spread the length of a pipe
• Powers a Steam Engine slower but more safely
Disadvantages:
• More opaque due to physical nature, less light (power) transferred to project
• Cannot be used for melting metals


Spot Fresnel Lens Advantages:
• High power heat transfer (available in Crystal Clear Acrylic perfection cutting)
• Can be set to less of a focal length (ideal for cooking)
• Melts copper and many other materials
• Powers a Sterling Engine and Steam Engine
Disadvantages:
• Instant flame and work hazard
• Equipment damage
• Does not spread over a surface evenly

LINEAR FRESNEL LENS




SPOT FRESNEL LENS
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