How can I lower the temperature ? (The light doesn’t have a controller)

Install an intake fan that draws air from somewhere else in your house with cooler temperatures like your basement.

Hey buddy. The only way to lower the temp when it's that high, is you gotta make your plant use to high temps. There are lots of nutrients van help to grow in that range. What you can do, this goes for leds and lamps as they both get hot only dif with leds is the driver gets hot. If you have an intake fan have it pointing at the driver if you have leds or towards your lamps. Also that swing is massive. So it's about doing it smarter rather than harder. If you temps are so high in the day and so low in the night you can run your lights constantly through the night and and whenever it's hottest you can make that your rest window and an intake fan is easy adjustable so y9u can aim it at the lamps/drivers when lights on. Also if you leave your tent windows open an extraction set up will only draw in the same outside temp so it's Better to have air been blown in onto hot setups. Feel free to DM me if you need more details. I don't have temp issues like that but I've been learning about temps. If it gets that cold your RH must go right up does it? As RH changes as the temp they come hand in hand.

Das Ist natürlich eine knifflige Angelegenheit 😅 Also ich würde versuchen, die Abluft zu erhöhen, insbesondere im Bereich unter den Lampen. Dazu wenn möglich mehr zuluft und Luftbewegung zu den Pflanzen. Das könnte natürlich die Luftfeuchtigkeit weiter senken, welche mit 40% bereits etwas zu niedrig ist 🤔 Sollte das der Fall sein hilft da vielleicht ein nasses Handtuch, welche du in deine Box hängst. Die Verdunstung senkt die Temperatur und erhöht die Luftfeuchtigkeit. Das hat mir in sehr heißen sommern schon die Ladys gerettet 😅

If you can't lift your light any higher try putting something in the there to cast a bit of shade on the plant. Check what ppfd your getting with an app called photone