The proper bulbs along with gloss white paint in the housing and plastic lenses will go a LONG way to providing great light without the expense of LEDs or "upgrading" to 12v. Below is my 6v '38 on the left & my modern 12v pickup on the right. All I did was what I listed above.

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Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.