the concentration of energy (example; if you were conducting a lab and you use light bulbs as a energy source, higher wattage would be better then lower wattage.)
all of these need to be proportion to each other if you have too much of one thing and not even of the other then the organism will not preform photosynthesis efficiently.
LPG gas is basically propane and butane, and it is odourless in its natural state. The smell that you notice when there is a leak is actually the stench of an entirely different agent, called Ethyl Mercaptan (C2H6S). This substance is added to the gas when it leaves the main storage terminals.
