Diala Innocent

My digital thermometer I use in the room where I started breeding black soldier fly always reads RH between 77 and 89% while it should be 50% and the temperature is within the required range between 27and 30 degrees Celsius. What alternative approaches can help me bring the humidity down? I am in the Eastern part of Nigeria. Thanks.

I tarted indoor black soldier fly rearing but for two attempts I could not see them mating or laying eggs. The first one I had about 300 flies and the second about 500 flies without mating or laying eggs till they all died. The room is about 12ft by 12ft. The light is two 100watts bulbs.