Noobie question here buy can someone tell me what is better about having a red heat lamp? Should i switch mine for a 40gal tank? also if using on a 25gal can you use it 24h or should you turn it off at some points? I have UTH for both tanks, thermometers, and hygrometers. just more so curious about the benefits for these lights? Would the red lamp help the humidity stay longer?(cage top)

any help appreciated thanks!