Yeah look on Amazon for LED headlights. I've got a 16 1LT and use this

Torchbeam T2 H13/9008 LED Bulbs, 12000LM 6500K Cool White, Compact Size, 400% Brightness, Replacement Bulbs, Pack of 2 https://www.amazon.com/dp/B07SZMVNC7/ref=cm_sw_r_cp_apip_MSJMLSyoGs5H4

If the 18 is same as 16 you can change them yourself. The space to remove the lamps is small and it helps to have smaller hands and use thin gloves. Otherwise you'll probably end up with scratches on your hands. I think there's also YouTube videos.

I also replaced nearly every exterior bulb with LED'S. Not all at the same time. My advice is to input your Spark's specs into Amazon so you'll get better compatability. I did buy some that were problematic and returned. don’t always buy the cheapest one than Amazon lists. The only bulbs I was not able to replace were the front turn signals. All I ended up with was hyper flashing despite front and rear bulbs being same brand or different.