more battery's or a better bulb.
The Shorter the wire the brighter the bulb ! Because if it is short then it get brighter and the more batterie the brighter the bulb ! Or the lower voltage the brighter the bulb !
Usually a higher voltage will make a light bulb shine brighter; but if the voltage is too high, this can also destroy the light bulb.
by shorter wires or thiker wires
quality of reflector, type of light emission, (filament,gas filled)
If the current is stronger then the bulb will be brighter.The reading is much easier when you sit under the brighter bulb.
That does not depend directly on the brightness of the bulb, it depends on the current drawn by the bulb (which depends on the efficiency of the bulb). For example an incandescent bulb will draw much more current than a much brighter CFL bulb or LED bulb. Therefor switching to an brighter LED bulb can make the battery last much longer while switching to a brighter incandescent bulb will make the battery run down quicker.
The bulb will get brighter
A brighter future!
change the battery
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If the current is stronger then the bulb will be brighter.
Two batteries in series will cause the bulb to burn brighter.