Is the air different on your left than on your right?
No.
Why?
Because it's the same air. It's the same pressure, the same makeup, the same everything. So you can walk all over the earth at the same level you're at and all that air is going to be the same.
The only way you change that is by going up or down. As you go down towards sea level, the air gets thicker. As you go up it gets thinner. But no matter what level you're at, it's the same all the way around the planet. Having more of it makes no difference.
Electricity and light work the same way. If you have 10 receptacles in your house each rated at 15 amps, does that mean you now have 150 amps to work with on any given receptacle? No. You don't. You have exactly 15 amps. You hook up a 150 amp device to any one of those receptacles and you'll blow that breaker sky high.
Light is the same way. Putting a 100 watt light next to another 100 watt light doesn't give you 200 watts of light. It simply gives you more coverage of that 100 watts. It's not going to produce the same spectrum and power than a light twice as powerful will produce.