I can give you a glulam beam size that matches the strength and stiffness of a 4x10 doug fir beam. Is that reasonable?
Neither of those sizes will work. I can only provide the size here or I can submit an additional service offer to provide detailed calculations showing the glulam is at least as strong and stiff. Neither of those sizes will work, though. Let me know how you would like to proceed.
Here...in the chat.
No problem. Good luck with your project.