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It depends on the voltage rating of each lamp, and the value of the supply voltage. It's important to understand that a lamp will only operate at its rated power (therefore at its full brightness) when subject to its rated voltage.

So, let's assume each lamp is rated at, say, 24 V.

If connected in parallel across a 24-V supply, then they will both operate of full brightness.

If connected in series across the same 24-V supply, then each lamp will be subject to half its rated voltage, and will be very dim.

On the other hand, if connected in series across a 48-V supply, then they will each be subject to 24 V, and will both operate at full brightness.

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