First off welcome back and thanks for giving a neglected chameleon a good home.
I went back to look at your previous thread and saw that you got great advice from
@Beman and
@MissSkittles already. I can hop in here and clarify a bit! It's really an iterative process getting husbandry down right. You set up the basics as recommended here, observe your chameleon, make tweaks as needed based on your temps, humidity, etc. So don't get discouraged!
In this post,
@Beman said to remove the film off your Zilla light (or no UVB gets out) and go buy the proper T5 5.0 High Output linear light for the right UVB levels. Did you do that yet? Proper UVB is key to prevent chameleons from developing Metabolic Bone Disease, or MBD.
https://www.chameleonforums.com/threads/new-chameleon-owner.184607/post-1696783
I believe those blue lights aren't good because the light can damage the chameleons eyes. As you know their eyes are part of what makes them unique and they also happen to be very sensitive! So you'll want to get a regular white incandescent light to replace the blue light.
It's important to get the right lights so that's why I'm making these points first.
But regarding the light schedule, 12 hours on and 12 hours off for UVB. You can have the heat lamp on for the same amount of time, too.
A lot of members here, myself included, have the heat light on for a few hours in the early morning and afternoon for Veileds (mine is 8am to 3pm). That way they get heat as they need in the morning and after eating, and then you save electricity and they don't bake themselves all day. I live in Florida so things get hot in the afternoons and turning off the heat lamp helps keep ambient temps in a safe range, too.