400 watt MH, is there a dual spectrum bulb

I'm picking up another 400 watt light for a grow tent. It's a MH light. Is there a bulb that runs closer to the flowering spectrum for this ballast?

If not, could I couple this with my pre-existing 400 watt HPS and add a bit more light and a full spectrum?

Thanks for any replies.

I don't think a dual arch light is made for a 400w mh only ballast. You can pick up a conversion bulb that will run at around 2100k. Nearly the same spectrum as HPS. Plantmax makes a good inexpensive one.

I think it's not a bad idea to have both spectrum... I m going dual this time and we'll see what happen, I thought of buying a conversion bulb myself but I didnt think I would get 120$ more worth of bud out of it! maybe I am wrong but I did fine with just the MH last year so now I got both...

there is one on here http://www.progressive-growth.com/conversion_bulbs-hps-mh.php the Hortilux 360 Watt H.P.S. Conversion bulb will run on the MH ballast

I think the plantmax ones only run about 35-40 bucks if you shop around. I sold my mh ballast a while back but remember them being pretty cheap and effective.