Droptines said:Oh yes,,they crank some heat.I have a Zoo-Med for a 30gal.,on a 30 gal.tank.When I put the digital thermometer on the glass bottom of the tank,,110.0,,now with the substrate on top, I get between 83-85 inside his warm hide.I know he just curls up in there,not trying to tunnel to the bottom of the tank,so the temps are good.I am using a dimmer set up for now.