Lightbulbs

As shown above, I have a row of 8 light bulbs, initially all switched off. There is a button below each light bulb that will toggle the bulb on or off.

I want them to be in an alternating off-on state, as shown below.

To do so, I press a block of consecutive buttons in a row. Here is an example of how it can be done in 4 steps:

Can I do it in less than 4 steps?

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