its a 500w mercury vapour light
the description in the book says (phosphorous coated to promote blue and red spectrum so you can veg and bloom, more blue light than red)

is this the right light to use as some one said earlier that i need blue and red light's. i could really do with the help so i know what light to get if this is the wrong one. but if it is how low to my plants should it be

thank you for any help in advance