Light Green Seal or Dark Green Seal. That is the question…

BNeelyCoinRarities

I bought this $500 FRN serial number 35,639 attributed as a Dark Green Seal. I thought this was a very low number to be qualified as Dark Green, so I went and found some archives of many higher (sometimes much higher) numbers getting a Light Green Seal designation, including a CU66Q serial number G51814. Other serial number attributed to LGS is G34501, G38709, G38972, G56269 etc. Some examples are below. The 6th edition Small Size US Paper Money book says serial numbers up to 92000 are LGS. So, is my serial number 35639 a LGS or DGS? I did try to research some other threads but didn’t find them helpful in this situation.