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[[Image:PlanksRelation.JPG]]
Where E is the Band Gap energy, h is [http://en.wikipedia.org/wiki/Planck_constant Planck Constant], c is the [http://en.wikipedia.org/wiki/Speed_of_light Speed of Light], and λ is [http://en.wikipedia.org/wiki/Wavelength Wavelength]. As already stated, the wavelength must be known. Looking at the spectral readout, you can see that while at 400 nm the material is absorbing ambient light at a high intensity but drops shortly afterward. Just looking at the readout, one could estimate that between 500 and 550 nm is where the bottom of the bell curve starts, and that would be the wavelength to be used in the calculation for energy{{PE|http://www.perkinelmer.com/Content/applicationnotes/app_uvvisnirmeasurebandgapenergyvalue.pdf}}
== Design ==
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