Upgrade my light bulbs?

I have been doing alot of night riding lately and it’s a blast, but now I want more light. Don’t get me wrong the stock lights work ok but it would be nice for it to be brighter. I do not want to buy any aftermarket light kits or light bars. Just wondering or there any bulbs out there that I can buy and just replace the stock bulbs with that will give me more light? I have a 15 Sportsman 570.