The wattage rating of a timer is governed by the manufactures specification. As long as the light bulbs wattage rating is not higher than the timers rating, the timer will be alright to use in the circuit. The circuits load is what governs the wattage of the circuit.
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A household timer typically uses a very small amount of power when the device is turned off, usually less than 1 watt. This power is often used to maintain the internal clock and standby mode.
Never use a halogen light bulb over 300 watts to prevent overheating and reduce the risk of fire hazard. It is advisable to check the manufacturer's recommendations for the specific fixture to ensure safe usage.
Hoovers use 1000 - 2000 watts
Light bulbs use 7-150 watts, a toaster uses 700-1200 watts.
A microscope is nothing more than magnifying lenses. Some of them use artificial light using electricity. Some microsopes use no electricity (zero watts) while a large electron microscope could use kilowatts.