Can I run two 600w led and two 600w hps in a 2sqm tent , will it drastically affect my yields compared to 4x 600w hps

I'm currently running 9 bubble pots in a 2 square metre tent , was planning on running 4x 600w hps like I always do but since the weather here in the UK is getting hot I'm struggling with head issues , have a good extraction and passive inlet + cooler fan with ice box etc , still finding it hard to hold the right temp, in veg right now and have been using 2 x600w hps bulbs turning them down to 400w (dimable) when heat is at its worst , got a 600w Mars eco led full spectrum today and put it in place of one of the hps, I now plan to finish veg with one Led one hps, then I was thinking to buy another Mars 600 led and have one hps in one square meter(top left ) and one (bottom right) and the two LEDs top right and bottom left , my question is will doing this greatly affect my yield? Last few times using the same set up (not in summer) I got 74oz dry and 81oz dry same strain same food , pots. Everything is same apart from the heat and now the lights , what drop could I expect, has anyone got any experience with Mars 600w led ? I know nothing about running with led anything anyone can advise me would be greatly appreciated thanks

Before and with led

Also may I add I know that 3 of the 9 plants are a week or so behind and will be pulling them to another tent for a bit of extra veg time while the rest are in flower