Hello !
I wanted to buy an Arduino board and now I have a question:
How many lamps can I connect to an arduino mega 2560 ?
Can I really connect 54 lamps with an arduino ?
And another question is...
How many volts can I use for the board (max.) ?
Over 10 Volt or is it to high voltage ?
Well....I will happy when i get a good answer !
(sry my english isn' t so good)
Above you can see that, the max voltage is 20V, recommended max is 12V, but you can use relays to control higher voltages and lamps.
You can control 54 pins. That means you can connect 1 or 10 lamps on 1 pin and turn them on and off simultaneously (in the same time).
in a glance, if you become more specific about those lamps maybe i can help you further.
Thank you for your answer !!!
When I need help I will ask you 
Why did you create a poll?
Max I/O per pin is 40mA. Total max current of the Mega2560 is around 200mA. So it depends on how much current your devices draw. Generally you'll need a transistor connected to the I/O pin to drive a load.
Ouhh ! Sorry ! I am new here and I didn't know how to do a quote ;D
Thank you !
I will show how much mA I need !