The best way to get better illumination from an H5 (9004) reflector headlight is to throw out the H5 bulbs and buy H4 bulbs along with H4/H5 adapters.
Please go to the listing for H4 bulbs for in-depth information.

 The best way to get better illumination from an H5 (9004) reflector headlight is to throw out the H5 bulbs and buy H4 bulbs along with H4/H5 adapters.
Please go to the listing for H4 bulbs for in-depth information.