Quote Originally Posted by Dev_DeCoste View Post
That is correct.The UTH works but the air temp still gets too low. Does it matter how close the RHP is too the light inside of the T8?
I would leave a few inches between the light and rhp, the further you away you can get it the better, I have my lights about 3-4 inches from rhp.

What I was saying is since your going to be using rhp you no longer need to use uth. If you put the rhp on the left side or right side of the ceiling and set the thermostat until the ground temp is 88-90 under the rhp the heat will also radiat over to cool side making it around 80 giving you a perfect heat gradient without using the uth and wasting power. Using a uth with a rhp is wasting the benefits of a rhp IMO, unless of course the rhp can't get the hot side to temp and in that case it would be ok but would be better to get a stronger rhp then. My house is 60-65 24/7 365 days a year and I have no problem using a 40w rhp to maintain temperature and I don't use any other heating device with them.

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