That’s what I said for goodness sakes, 2watts input. 40 watts output. It’s all about efficiency & that’s what I’m trying to get over, you only use 2watts to get 40 watts out depending on the way the bulb has been put together
At this stage I hope you're trolling, but just in case:
Energy cannot be created or destroyed. If it could be created, we wouldn't have energy bills. It can be changed from one form to another.
Watts are a measure of power, or energy per unit of time. One watt = one joule per second. Since watts measure energy you cannot create watts. You cannot get 40 watts out if you only put 2 watts in.
I'm going to simplify this bit.
Old 40 watt incandescent bulbs consumed 40 watts of electricity, which they gave out as 2 watts of light and 38 watts of heat.
LEDs consume 2 watts of electricity which they give out as 2 watts of light and 0 watts of heat.
Thus the two bulbs will look as bright as each other, because they're both producing 2 watts of light. One just waists 38 watts as heat which it gives off up in your ceiling so it doesn't even heat the room effectively.
It's not that your lovely LED bulb has 2 watts of input and 40 watts of output. It's that the old incandescent bulbs had 40 watts input for 2 watts output of light.
Now everyone else can insert their own joke about not being the brightest bulb in the pack.