My New MH Bulbs.. Won't Ignite >:

[vinsaltank]

Hi all.
I just purchased some new 175w metal halides to replace my 1 year old ones. :happyfish
I got the same base, same watts. exact same style , just a different K. ( 20k)
Anyone have any ideas why these new bulbs wont ignite? Is it a problem with my ballast? :help:
Should it take more then 15 minutes to fire up? ( I shut the ballast after about 10 mins of waiting). :thinking:
My old 14k, 175w. took like 30 secs to ignite.. :help:

 

[dingo0722]

Are they the same brand? One other thing is that there are 2 types of metal halide ballasts and bulbs. Some are Pulse start and some are not. Check out ww.venturelighting.co. They have a section explaining the difference. You might have bought a pulse start bulb, and don't have a pulse start ballast