What are you asking?
That it's bigger? Easy. You can see the bar of energy around Surfer as he falls:
Then see how that bar compares to the sun he created.
Now look at Superman's scan. His HV is surrounding the entirety of Earth. The text specifically mentions all 7 continents. Lantern specifically says ALL over Earth - so that even includes the areas on the 'dark' side of Earth.
He doesn't even need it to be that big to deal with Knull. Let's say..... building sized blast? Car sized?