There are two types of electrical connections: series connections and parallel connections. In the case of series connections, the overall current is the sum of the current through each individual device. All the devices are connected in a series and they are all switched on and off simultaneously. In the case of parallel circuits, the current through each device is the same and we can have individual switches and hence control over each device.
Rob must have made all the connections in series, instead of parallel. That is why the bulbs got dimmer. One easy way to check is by adding or removing one of the bulbs. Removal of one bulb will cause the other bulb to glow brighter. The addition of another bulb will cause the bulbs to glow dimmer. If it had been a parallel circuit, the addition or removal of bulbs would not affect the brightness of the other bulbs.
Hope this helps.
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