Greetings from Canada!!...
Italian Forum link - Area Discussioni Libere
Vero 29 is very big COB for 60x60cm grow box. You will only need 1!
Must keep V29 high or will burn plants!!! Something like 60cm above. Unless run very soft, less mA than max...maybe 4xVero 13\18 would be better, for heat and light distribution in your case?
For dimmable drivers, 'mean well HLG or ELG' are kinda expensive and excellent...could always power with a 'mean well APC', instead of dimming just move COB up a cpl of inches(inverse square law MUCH worse with 120°!)....
Good luck NL97