The wattage of the bulb isn't so much a concern as the temperature of the basking spot. The temps need to be in cue with your animal, and whatever bulb you need to use to achieve the required temps is fine. The bulb isn't the important factor. The important factor is making sure your temps are all where they should be. Check the caresheet for Veiled Chameleons here:
https://www.chameleonforums.com/care/caresheets/veiled/
You said you have a baby male veiled. According to the tried-and-true caresheets, the temps should be as follows:
Baby/juvenile (<9 months): ambient 72-80F (22-26C), basking 85F (29C)
Adult males: ambient 75-80F (23-26C), basking 90-95F (32-35C)
Adult females: ambient 75-80F (23-26C), basking 85F (29C)
So as long as your basking spot is close to 85 degrees, you should be fine. You said your thermometer is reading at 75.... is that for the
ambient temperature or the
basking spot temperature?
I forgot to comment on the fogger earlier. There is no need to run it constantly all day. You don't want water to ALWAYS be on the leaves for him to drink because you want to give your cage some time to air out and dry out in between the wet sessions. If you always have water on everything at all times, then that can cause mold issues and it can also make the air stagnant, which could lead to respiratory infections. Giving the cage a couple hours or so to dry out In between spraying it down will save you a lot of heartache in the long run. As for the humidity levels, please refer to the same Veiled Chameleon caresheet I linked above.
"
Humidity is an important aspect of chameleon husbandry. Veiled chameleons require levels around 40-70%, which can be achieved by several misting sessions a day over all areas of the cage. Live plants help increase and maintain humidity."
You'll want it to spike to the 70% range or around there a few times a day, but otherwise, you'll want to keep it more towards the 40-50% range. It's definitely okay to let the humidity drop to lower than 65% that you currently do, as they can tolerate 40% humidity levels. It won't hurt the chameleon.
If you have any questions, one of our members here,
@jannb is an absolute expert on Veiled Chameleons. She can probably answer just about any question you can come up with. She has some awesome chameleons. Check her out!