And light is cumulative.
If in doubt, light your living room with one 13w CFL.
Then add another, and another, and another.
Gets brighter with each bulb, no?
Whether many small bulbs are more efficient than one higher output bulb is a whole different ball of hash.
And I will say this about many of the "regulars" in Club 600: there are some heavy duty growers in here (not me) who are well on their way to Cannabis Mastery, and all combinations and types of lights have been tried by a good majority of us (me included).
The only way you'll ever not have parts of your plants in shade is to either lollipop them all, or do vertical lighting with equal amounts of side-lighting (...I'll see you on the dark side of the moon...) so every leaf is saturated with light from all angles.
That would be ideal.
Also expensive to run (many of us are on budgets), as the more lights you add, the more heat is generated, so AC and humidifiers/dehumidifiers become necessary, etc.
To kvetch over a branch or light pattern is something we all have done when we started out.
We all worry about every little detail, every little error, every possibility of improvement.
After a while you'll find yourself less stressed about it.
The other option, if you're unwilling to move your light or adjust it's aim (or, like me: a light in a fixed position in a wooden grow box), is to turn plants periodically so they get more adequate coverage.
But doing so means the entire plant gets less light which equals smaller & fluffier bud.
Heat is a killer for bud density, unless you are augmenting your grow with C02.
Also, any fluffy buds you don't find worthy of smoking can always be added to your trim stash so you can make BHO or hash out of it.
We've had a rash of new growers asking questions, then doing everything possible to ignore advice from various individuals whose growing prowess are nearing legendary proportions.
If you want advice you can trust, do a search on the person giving advice so you can weigh their experience level before you dismiss what's being said.
If you click on the users name next their avatar you will get a drop-down menu that let's you check out the person's posting history, check out their grow journals and any articles they might have contributed.
The fact that you want to make sure you get your ducks in a row just means your on your way to being a better grower.
But the guys here in the 600 aren't out to steer you wrong or make you grow in a style you don't want.
It's just that every grow is a matter of compromises, and having one kola taller than the others is nothing.
You can tie it down (bending the trunk gently) so the tip is at canopy height, or slowly "snap" it over to a 90-degree angle at the height of the rest of the canopy and let it continue on.
Or leave it be, if it's not in danger of burning into the light.
I believe whodat has a PRIME example of THAT scenario (hateful respect...)
That's one of the cool things about growing cannabis: a million ways to grow, and none are best for all situations.
Hope you'll stick around, we can always use new peeps in here and new bud pR0n.
Peace!