You can find out what the wattage they are by the pn# and call the local parts store like AutoZone. Not sure what you have now, but it’s could give you something to try if it’s brighter (higher wattage). The blue hue will be a little deceiving though. Hella makes some nice replacement bulbs for your application. And they make them in all kinds of wattage. Will work nicely with your relay mod.
s/t