Be aware that both the LED and halogen headlamps are a single low/high beam unit and changing one affects the other at the same time. Changing the aim increases the chances of dazzling the oncoming traffic and attracting the attention of law enforcement as they may be set too high. I recommend that this is a job for the dealer or a shop that has the levelling equipment to do it properly. I would suspect the "too low" setup of your EC may be your perception and nothing to do with the actual light output. Use the information in the listed page to check the settings of your EC before carrying out any adjustments.
It may be a better choice to look at a set of higher light output lamps than changing the settings. There are many types of halogen replacement lamps that are the correct wattage but output a higher light level and keep your aim at the correct setup. Plus replacing the lamp is much easier than adjusting settings and is easily reversible if need be. If you have LED lamps then you are out of luck.
I'm not sure how they equip the SE and SEL equivalent models elsewhere, but here in the U.S. those models have the LED projector headlights and as far as I've seen they all have the headlight leveling switch on the dash. (p5-194 owner's manual). It's not available for halogen bulbs, so if you have the LED option, you can adjust them yourself. If you have halogens, then follow Zarbs' advice and take it to a shop.
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