Which one of these 2 HPS bulbs would you choose

Philips Son-T Plus

(http://www.hydroponics-growshop.co.uk/product.asp?Id=1441-Philips%20Son-T%20Plus%20400W)

or

Sylvania Grolux

(http://www.gardenofedenhydroponics.co.uk/product.php?productid=215)

Im currently using the Philips son t 400w & soon Ill need a new bulb Ive heard good things about both but not sure which one would be better for marijuana.

I'd pick the son-t plus

Thanks Bone anyone else.

I'd give the Sylvania Grolux a shot. It is cheaper correct? Also, what I could find out on the bulb it is brighter in lumens by like 3000. http://www.bghydro.com/BGH/itemdesc.asp?ic=HLRBHPS04GL&eq=&Tp= This is a site in the states but it has some info on that Sylvania bulb.

Ive read that the Grolux has a little of the blue spectrum which is probably wont contribute much in my grow op as Im doing a perpetual grow. Thanks tSunami.