since that lizard light is only gonna help during flowering, id wait til then to put it up, no use of having it now it seems based off what svc said(i have never used a lizard light or had a lizard lol). as far as mixing lights, yes you can but if you can fill it with all blue then do it. during flowering however, you do want to add a blue to all the yellows as that spectrum promotes growth. imo and experiences, i havent seen any benefits of having the yellow in during veg, they have just taken up space that could have been utilized by the highly sought after 6500k's lol