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There are innumerable (not very reliable) sources which spout that LED streetlights are more efficient. Obviously that's not based on facts. The information likely comes from the companies wishing to sell their new products, and it appears they come up with the claim in part by somehow comparing LEDs to non-LPS street lights, which are really only used in a tiny fraction of circumstances, where more color accurate light is required. In addition, they seem to use more-focused optics in new LED streetlights to compare to unfocused LPS lights, and generate more desirable numbers that way. They often also tout how much energy can be saved by enabling a motion-detection mode, which LPS isn't suited to, but I'm not aware of any municipalities who have done so, as there are significant practical drawbacks.

The comparison can get a little bit more confusing because LPS lights dim a bit over their lifetime, so slightly weaker efficiency numbers can be determined if one is so inclined. But as for reliable sources, the best I've heard is that, with twice the longevity of LPS, the reduced maintenance costs of LEDs can make up for their higher up front costs.

But back to your question... I have no doubt many people believe that LED streetlights are more energy efficient than existing LPS lights. BUT I would certainly expect much better of civil engineers, and due diligence from even non technical personnel. They merely need to compare the listed specs like power consumption, between the various options, before recommending or approving a major purchase... But feel-good measures, and green-washing, are sadly all-too common.