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This conundrum is exemplified by a comparison between Bernard's NELPA cooker and the Devos cooker. In the aerial-view schematic shown infigure 1, the simple shape of the NELPA's concentrator is only able to focus light in the Y dimension, whereas the complicated shape of the Devos' concentrator is able to focus light in both the X and Y dimensions. The NELPA is much simpler to construct, but the Devos is significantly more robust, using its wide design to intercept a larger area and yield higher power.
Figure 1 - Simplicity vs. Power in the Bernard (left) and Devos (right) cookers
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