i need to add extra heat to my tank... my basking spot is not getting hot enough which doesnt make sense to me it use to reach almost 100 degrees... i have the zoo med 100 watt powersun.... im ordering 2 more since this one is almost 6 months old however i have a new one that burnt out right away and im sending this in for a new one.... my question is i never used anything extra for heat but now i need too so can anyone explain to me how they work and how much more they can raise the temperture? if my basking spot is 85 and i wana bring it to 100 can one of these bulbs accomplish this? also can i leave them on 24 hrs a day for extra heat ?