It's not really the number, but the lamp type, housing and room characteristics the pendants will be in.

I am having a tough time with lighting. The total kitchen width is about 14 feet, the island is around 32 inches wide and 10 feet long. The ceiling is 8 foot. We will be having recessed can lighting and undercabinet lighting. I really like the Neirmann Weeks chandeliers for over the kitchen table, but I am stuck on what I need in the way of lighting for the center island, which will be where the majority of prep work takes place.

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The kitchen will be predominantly creams and yellows, although the center island is shown below with the dark brown counter:

Any ideas?

The minipendants I have looked at come in Xenon or LED.

1B50 GY6.35 Xenon 50w
LED module 5.8w

Will this amount of light be sufficient for my over 40 year old eyes?
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