Why are some of my Westinghouse Solar lights flashing while others glow constant at night ?

Westinghouse Energy Free solar landscape lights?

Very bright led. ground stake. made in china. Were sold at Costco

Are High Output solar lights worth the extra money?

I am looking at this set: Westinghouse Solar Utopia High-Output Spot Light Set, 2-Piece at Walmart (I know, evil me). But they are $50 for two vs $20 for normal ones. I am really hoping these are totally worth the money because I will be using them to illuminate a flag pole (I am a stickler about flag lighting out of respect for those that deserve it). Is the difference noticeable? Do they stay lit for a long time? Would it do a great job of illuminating a 10 ft tall pole with a flag on top? ( I am really hoping that these work well. I really don’t want to run wire to put in hard wired lights because the flagpole is a LONG way from the nearest electrical lines. It would be a MAJOR pain to get electrical power there. )Thanks in advance!