Heat your headlights in an oven @ 200 degrees for 30 minutes, the glue that holds the clear lens on will loosen enough to gently seperate the enclosure. The diffusor is right in front of the low beam bulb, remove it. Respray with that headlight repair stuff if the reflective background is dull or has started to flake. Put the headlight back together, seal with RTV if you like.
Take a high beam bulb and modify it so it slips in place of the low beam bulb. A small pair of nippy cutters and less than two minutes does the trick.
Re-aim your headlights. They are a lot brighter, go further, and the brightness is well diffused so you can see way off to the sides. No one confuses them for high beams, but I've been in some cars whose high beams aren't as good as my low beams.