It’s not impossible to reset them, but you may or may not find it easy to do.
As other people have said, the official integration between Hue and SmartThings requires that the bulbs be connected to the hue bridge, not directly to the smartthings hub. This is included in all of the official documentation
That said, if you want to have them working without the hue bridge and you did get them connected, it may be that all you have to do is Link them to the correct device type handler (DTH). Because there are some people who use them that way. It’s not recommended, but some people do it.
OK you are going to need a custom device type handler. That’s not as scary as it sounds, when you use custom code it’s mostly just a matter of copying the author’s code and pasting it into your own account. Here’s the FAQ for that process (this is a clickable link)
If after reading that you decide you want to go ahead and try to use a custom device type handler, you need to find the right one. Again, that’s easier than it sounds but the first thing we need to know is exactly what model bulbs you have. Are they the hue white? The RGBW? light strip? So if you do want to try custom code, give us the model numbers.
If you decide to heck with it, you don’t want to use custom code, and you want to go with the official integration, The easiest thing is just to return the ones you got and buy a starter kit with the bridge. Follow the directions to add the new bulbs to the new bridge, then follow the directions to add a bridge to your SmartThings account and you will be all set.
https://support.smartthings.com/hc/en-us/articles/200848024-How-to-connect-Philips-Hue-devices
Oh, and you are not going to be able to add your old bulbs to the new bridge, unfortunately, without a lot of extra work. But if you really want to do that, let us know, and we’ll get started on that process.