Bulbzilla 11.9 - High Output Bulb Kit (H11 to H9 Conversion)This BULBZILLA product manufactured by Aspire Auto Accessories allows you to easily place an H9 bulb into any light that uses an H11 bulb. H11 bulbs are commonly used in low beams and fog lights. H9 bulbs are commonly used in high beams. Replacing an H11 bulb for an H9 bulb gives you a 60% increase in output! Lumen difference: H11 output: 1250 lumens H9 output: 2000 lumens Features: A noticeable difference in lighting output Kit will swap out two H11