Adding a 400w mh to 1000w flowering room..

Hey

Ive got a 4.5x 4.5 ft perpetual sog with 60 clones. Lit by a 1000w hps.

Got an extra 400w mh lying around and want to supplement the area.
so im wondering where should i place the MH.

On the 1-2 week 12/12 clones side (this is where im thinking i should place it)

or

on the clones 6-8 week old clones

Opinions please?

And will +400w make a noticeable difference in yield?

They make a RAPTOR dual lamp hood for 2 bulbs.

they also just stopped making ceramic metal halides which will go into your mh fixture, i'd get one before they're all gone . If you have two hoods it's unnecessary to get the dual lamp hood

What i really want to know is if lumens will addup?

Or is it pointless to have a 400w supplementing a 1000w?

Bump......