@DeadwebsiteBoringcommunity, Its not a pure COB. These are the actual specifications:
Product Specification
[LED Qty] 28pcs 5w Bridgelux/Epileds + 1pcs 10w Cree COB
[HID Replacement] Replaces 150W HPS/MH
[Input Voltage] AC100-240V
[Avg. Power Draw] 62±3W
[Core Coverage Area] 1.5x 1.5ft at 24" Height
[Max Coverage Area] 2.0x 2.0ft at 24" Height
[Dimensions] φ6.9x 2.4 inches
[Item Weight] 2.1lb
[Lifespan] 50000h
[Frequency] 50-60Hz
[Warranty] 2 years
So there's a single 10W Cree COB in the center surrounded by 28 mostly red and blue lights. I think there's a single green LED. And I believe it has one or more UV and IR LEDs within that count too. That's how it produces that spectral ratio.
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