Prakasa 300w light spare cob help

[lumpyspace]

I have some cobs that need replacing that should rated for at least 50v. I tried using some with the highest volt rating I could find 30.1v and it just flashes indicating it's not correct. can somebody let me know if can source these or should I change the power source to match the voltage cob I have found?

 

[Ponky]

https://www.samsung.com/led/lighting/cob-leds/ Samsung has a large line of COBS. So does Phillips and Cree. Between the 3 one has something that should work.