<https://syronoptics.com/products/lp670-longpass-filter-t-95-685-1200nm-od4-200-655nm#product>
<http://schema.org/description>
"Cut-on Wavelength: 670nm (T=50%)Transmission Range: T&gt;95%@685-1200nmBlocking Range: OD4@200-655nm\n"
<https://syronoptics.com/products/lp670-longpass-filter-t-95-685-1200nm-od4-200-655nm>