100 HP = 74.5 kW via [link|http://www.gordonengland.co.uk/conversion/power.htm|this] conversion page.

110 bulbs * 60 W = 6.6 kW - so you'd need 1240 bulbs to match a single 100 HP car.

So, it doesn't seem to add up.

The analysis seems to be based on assumptions about CO2 production. At least that's what seems to be going on if you follow the discussion [link|http://hybridblog.typepad.com/my_weblog/2006/04/equating_prius_.html|here].

HTH.

Cheers,
Scott.