That would be 55W HIDs, like these: 12V 55W H11 Hid Xenon Conversion Kit 5000K 1618347 2017 ? $29.99
I have 35W HIDs in my Insight and can say that those are more than sufficient, being over 3 times as bright as the halogens.
A 55W pair would be 5 times as bright.
The K value designates the colour; it is supposed to emulate a glowing body at that temperature (Kelvin).
5000K is daylight white. 6000K is cool white. 4300K is white with a hint of yellow. 3500K approaches halogen, 2800K resembles halogen. 8000K is blueish white and on the verge of illegality in many counties. 12000K is blue purple.
In general lower K values produce more light than higher K values.
They don't get as hot as halogens. Halogens will melt the snow off the headlamps. HIDs don't, or at least much less so.
I had to stop to clear the snow off once.
One thing to keep in mind when buying the cheap Chinese sets is that they often come with metal tongues to pry into the H11 connector instead of a proper male H11 plug. You have to match the polarity or it won't light.
Do not touch the glass, clean with paper and alcohol or aceton if you're not sure they are clean.
The rubber plugs are for headlights in housings where the ballast does not fit; to block the hole you bore in it to let the ballast hang out.
Our G2 Insight has no such housings; you can just cut the rubber plug to free the wires.
You need to fix the ballasts somewhere, cannot just let them hang on the wires. There should be a mounting bracket in the kit.
After 4 years in the engine bay (not garaged) the tiny screws on my ballasts are rusting, a dab of grease or paint on them would prevent that.
Be careful as the frame parts in the engine bay are razor sharp and may cut you if you touch the edges.