gotta a question

I went to home depot today and i saw a 150 watt Curly light, but the box said it was 40 but 150 at the same time. what gives.

(going to be growing 2 plants will 2 of these lights make due?
sharpezor Reviewed by sharpezor on . 1 big 1000W or 2 500W HPS? would the 2 500's be as powerful...I know it will be more spread out. I'm growing 12 plants and plan to veg for awhile as to get the plants to the biggest size possible in that room. Rating: 5