sadly the temps vary, I have a thermometer a little below canopy level. It's usually from the mid 70's to the mid 80's. occasionally when weather is hot it has reached low 90's, there is nothing I can do about this unless I had A/C and I just cant afford that, so I'm watching closely for hermies. The light has a heat shield so I'm able to keep it closer than without. they have at least 3 weeks left so I'm hoping the buds will fill out a fair bit more but can never be sure how much.