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Sounds like a poor electrical connection - independent of the light bulbs. Many times the ground connection to the the steel frame / chassis becomes corroded resulting in a lowered voltage on the circuit (instead of 12V reaching the lamps - only 9 or 10 volts gets to them). Try gently tugging / shaking the wires at the lamp / wiring harness to see if the lamps get bright / dim again. This will help you narrow down where the loose connection lies. If you can't find the loose connection, you can also simply supplement the ground wire on the lamp circuit with another parallel wire with one end connected to the (-) post of the battery and the other to the ground wire on the head lamp. If it was a ground connection problem - this supplemental wire will solve the problem.
First, check that the battery connections are clean and not corroded. If not look for the ground wires that connect to the chassis. Check to see if any are corroded or loose. Finally if that has no effect, you have a short somewhere in your wiring. The easy way to isolate it is to pull the fuses for each device one by one and see if the dimming stops. The last one to cause the dimming is the problem. If it happens when you hit a bump it also might be a ground fault in the interior car grounds....good luck!
The silverstar bulbs while brighter, have a considerably shorter life span than conventional bulbs. If the headlights are dim, it would mean a bad electrical connection most commonly a bad ground. If they are just too dim for your liking and burn at the normal brightness, you might want to consider having auxilliary headlamps installed.
Could be a loose or dirty battery connection, poor battery, or alternator. Check all the cables and connections to your starter. Clean your battery posts. Have your alternator and battery checked. It sounds like you are either running off just the battery or just the alternator. One of them is not right.