No just to keep it warm until served
Most heat lamps are not designed for use on grass. However if you need to use a heat lamp for your grass be sure to get one that uses red heat instead of white. The white light will dry out your grass.
Heat lamps.
The infrared heat is transferred to the food by radiation.
because its gross to heat it more than once
Its radiation
Infrared radiation.
Although they do have some visible light, heat lamps skew towards the infrared end of the spectrum. Heat lamps are designed to emit light in the Near Infrared (.7µm-1.3µm), Middle Infrared (1.3µm-6µm), Far Infrared (6µm-40µm), and Far-Far Infrared (40µm-1000µm)
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Yes. Rewarming food only changes its consistency. Eventually it will get tougher and drier.
If you cook it for long enough, at a hot enough heat, then yes. But you can only "cook" once, then "reheat" once (a reheat is not a full cooking time, just long enough to get it really hot). Do NOT reheat the same meat twice, since it can lead to food poisoning.
True. Infrared lamps are commonly used in restaurants to keep food warm on serving counters or buffet lines. The heat generated by the lamps helps to maintain the temperature of the food, preventing it from cooling down too quickly.
Heat lamps are just infra-red ray emitter. In simple terms they release waves containing energy. As these infra-red waves reaches the food, they transfer into heat energy and thus heating the food. In summary light energy turns into heat energy.