Chilli 'Inferno'

How many chillis does it take to power a light bulb? I have no idea - but when I saw these growing in the garden centre this morning and read the label describing them as 'medium' to 'hot' I thought they must be packing some power. I left them where they were as I can't even manage chilli flakes or sweet chilli dipping sauce, but of course, before putting them back, I just had to take a photo of them!