Light surface temperature

Trying to raise my LST (Leaf Surface Temp.). I’ve literally tried everything I could possibly think of. Im in a 2.5x2.5x5.25 tents with a TS1000 Mars Hydro 150w light. Exhaust and filter are outside exhausting from the top, two passive intakes at the bottom. I have the light as close as I possibly can have it right now without light stress. My oscillating fan in under canopy facing upwards. My leaf temps are causing me to have to run low humidity to have my kpa in the correct range. My leaf temps are like 8°-9° lower than the air temps. Any suggestions or do I just need a better light? Lol lost with ideas now…