77deg F=25degC. I'm Canadian so...

No, that isn't too hot, could be a tad cooler though.

60degF=15.5degC. Now that, is a tad cool. You know what you should do to control those temps...instead of having the light on all day long, when the sun is out, have it run all night instead, when the sun is gone and it is cooler outside. You get what I'm saying? Having the heat from your light, plus the sun, will be harder to control temp. But if you had the light on all night, where the sun is gone, the temps will be easier to control. Hope this helps, peace.