Look on the label of the fixture ,it will tell you the maximum wattage the fixture will safely handle.
NO. Two 60W lamps will use 120W - which is more than 100W !!
There are 60W, 75W, 100W, and 150W bulbs. No standard 110W.
It mainly has 10W,20W,30W,50W,60W,80W,100W,120W,150W,180W,210W,240W,300W,360W.
There is insufficient information in the question to answer it. In series with what? Please restate the question.
Put it this way, a friend of mine uses her daylight bulb with her lamp, and puts it over the fish tank. I wouldn't use a 100w or 60w really, but all fish are different with their habitats. So i recommend seeking advice from a fish shop near you.
Let's examine what it means when a bulb is 100W rather than 60W. I'm assuming that you meant to state that they are 120V bulbs being connected to a 240V circuit1. With the same voltage on each, and because power is voltage times current, the current must be greater in a 100W bulb than in a 60W bulb. Since a incandescent bulb is a linear load, if you double the voltage then you double the current2. So the current through the 100W bulb is still greater than through the 60W bulb. Or you may analyze it a bit more. With both on 120V, for more current to flow in the 100W bulb, the resistance of it must be less than that of the 60W bulb. So you may generalize that under any voltage (same voltage applied to each), the 100W bulb will always have more current through it than the 60W bulb. 1Actually, if they are 120V bulbs in a 240V circuit, there is a high probability that they will blow out. But before they do, this is what will happen. 2Well, slightly less than double, because the temperature coefficient on the filament is positive, so the hotter it is, the greater the resistance. Although this may seem nonlinear, a light bulb or other temperature sensitive resistive element is still defined as linear if over the short term it obeys Ohms law at any instant of the waveform. The current in the 100 watt bulb will be greater. Power is current times voltage, so current is power divided by voltage. Voltage is the same is both cases of this question, so current is proportional to power at 240V.
10,000,000,000,000.000
About 100w for a cathode ray tube and 60w for an LCD.
60W should be sufficient. It really depends on the construction of the brooder.
The average lifetime of an incandescent bulb is around 2000 hours.
Not in the least, and you will still save money. A 100W equivalent will use only 20 to 25 watts, well below the 60W rating of your fixture. Much of the 60W used by the incandecent bulb is dissipated in heat. This is where the danger in over-watting fixtures lies.
Watts = Volts X Amps. Amps=Watt / Volts. So, with a 240V mains, a 60W bulb draws 0.25amps. On a 12 system (car/auto) a 60W bulb draws 5 amps. On a 110V mains, a 60W bulb draws .55 Amps.