3Ghz 450m power requirements

I noticed the spec sheet calls for 140 - 150 watts.  The 5Ghz 450m is "only" 70 - 80 watts.  What's so special about the 3GHz 450m that it needs double the power?  and an additional 18 lbs?

3GHz PMP450m is capable of SIGNIFICANTLY higher transmit power. EIRP is 52dBm (~158 watts)

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