Light Bulb Question

I am gonna change my light bulbs soon (its been a year since the last time). I use a 1000 HPS with a European type hood and have them air cooled.

Whats a good bulb to go with and why ?

THANKS all !!!

Eye Hortilux makes some of the finest agro bulbs available, and they claim for thier Super HPS line that their bulbs output up to 25% more ideal radiance compared to standard HPS. They're also an environmentally responsible company.

http://www.eyehortilux.com