I just got done kitting out my bike for night riding and I got this for a headlight:
https://www.amazon.com/dp/B07HF2W8QF
I never measured visibility with a tape or anything, but I’ve been concerned enough to point it down when I see cars coming because I’m worried I might blind the driver. Been thinking about putting some kind of hood type thing over the top so it can’t shine upwards. Works great for me so far.
I have this one and like it. Same lumens as yours.
It likely depends on the kart. If it has a roll cage a mount like this light uses would likely work. My Coleman kart did not have a headlight so I got this and it works great.
IPSXP 1000 Lumens Bike Light, USB... https://www.amazon.com/dp/B07HF2W8QF
IPSXP Bicycle Headlight, USB... https://www.amazon.com/dp/B07HF2W8QF?ref=ppx_pop_mob_ap_share
I have this for my eagle pro and it’s plenty bright for night rides.