Your 42 Watt at 8" is producing about 68,000 lux. Your 23 watt is producing about 40,000 lux. Exact amount depends on how many lumens they produce.
Those two are enough at that distance to keep your plant growing healthily.
Direct sunlight is 100,000 to 120,000 lux. More lux than that cannot be processed. Somewhere between 150,000 and 200,000 light toxicity sets in.
Symptoms of light toxicity are:
- Leaves turning from dark to light green as chlorophyll production decreases
- Leaves curling, twisting or bending to reduce the surface area exposed to the light
- Plant growth slows or stops, and may eventually die.
It looks like you are experiencing at least two of those symptoms.
I would recommend using just your 23 Watt light at around 4 to 5 inches away from your plant. Which will give you a bit above 100,000 lux, and save you some money on wattage. As the plant gets bigger, you'll need to add back your other lights.
Regarding temperatures:
I would try to keep temperatures no more than 85 degrees, but they should be able to handle up to 90 degrees, maybe a little more. I think somewhere around 80 is ideal.
I keep a small fan blowing on my plants for air circulation (carbon dioxide flow). I don't recommend too strong of a air current from your fan being blown directly on the plants. If they are too agitated, they'll be stressed.
Finally, in my experience, I can keep my room cooler by blowing hot air out, rather than attempting to blow cool air in.
After you fix the light and temperature issues, the plant should recover over a couple days.
