Brazilian Rainbow Boa husbandry question

[Sapphyr]

So, I purchased a 4 month old Het Hypo Brazilian Rainbow Boa(or something like that) and brought him home, switched out the bedding for what the breeder recommended, Jungle Earth, said it contained humidity well. Put his two hidey spots in there, one on the hot side, one on the cool side, and a soaking/water dish in the center. I also soaked the bedding so it'd evaporate to raise humidity. Yes, I know it's not 100% safe since it can cause mold to grow, especially with the humidity needed, but I do stir the bedding around from time to time, and after a day or two I dig to the bottom to see if it evaporated well. I've only had him for about 14 hours but I've had the cage ready for weeks, just had to switch out bedding. So, I ofcourse put him in there after it was all ready, misted and watered.

Now, I'd been monitoring the humidity, checking every 30 - 60 minutes to see how high it'd go with half of the top duct taped to prevent too much being lost and the other half having the heat lamp over it. I found after an hour or two it got to 70% humidity and began to decline to 60%. I was trying to get it to 80% or higher since that's what the breeder recommended. So, I ripped all the duct tape off, took a towel and cut out a circle for the lamp and soaked it in warm water, squeezed some out so it'd be damp, and put it over the lid. It instantly boosted the humidity to 70%, and over an hour or so it got up to 80% and stayed, so I'm content for now, but then the high humidity amplified the heat to 93 F, and I felt that was too high, so I switched light bulbs to the night light and it dropped to 80 F. I don't think that's too bad but I feel 85 F would be better.

So, my question is, is light an absolute must? Because I have a ceramic heat bulb I could also try, but it doesn't put out light. It's just, the day bulb gets way too hot with the humidity. Would lowering wattage help? I think it was a 100 or 75 watt bulb.