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So Lunchbox, you're saying that electricity is hot, stretched springs are hot, and a spinning wheel is hot?
They are all capable of generating heat.
You have it right in the second part of that paragraph; light is a form of energy, and can be converted to heat. But light is not, per se, hot.
I also don't understand what you mean by saying that heat is a byproduct of light. Are you saying light produces heat by virtue of its existance? Or that it is impossible to create one without the other?
The human eye cannot percieve one photon of light.
As for the mass of light, I suggest you read up on relativity. Light has no rest mass, but it does have momentum when it is moving (hence the idea of light-sails). You're thinking of Newtonian gravity, which involves two masses pulling against each other. But you need to consider that when something is moving at relativistic speeds, it can have momentum even if it does not have mass, and so can be affected by gravity. It's easier to understand if you think of gravity as a distortion of space-time, rather than a direct interaction between two bodies.
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Strewth
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