Being a new owner of two four month old salcatas and get colder I'm not sure if they are getting enough heat are maybe the lamps I got are no good I bought them from Lowe's one has a heat bulb of 50 watts and the other day bulb 65 watts and the thermometer is saying 90degrees should it be warmer and also should I be using a different light source I have been looking at the zoo med how good are they?