They’re pretty cheap and the 3-way and 4-way outlets are too. Just load up on them 
All that being said, the buds under my LED’s seem to be bigger, or at least a little ahead, of the ones under the less intense LED tubes. Light is a factor in yield. I think you’ll do fine, but you might do even better if you put some more intense lighting in. If that makes sense.
One must stay within their budget, though.
I can easily cover the 50W/sq foot with CFL, can even go for more if need be but if you think a combo of CFL + LED would be better I am happy to take advice. It’s not so much keeping within a set budget, I was just looking at keeping costs down. I am slowly purchasing + storing supplies each pay cycle while I source materials to build my work shed So I have time to save for more expensive items if they are going to work better for me.
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Rember it’s 50 true watts. Most 100w CFL’s are actually 23 watts. So, you’d want 2 per sf. I think you’re on top of it, though. Just wanted to make sure.
Yep always looking at true watts, I’m pretty sure I can source true 80w CFL’s for the veg. Ut I’ll be checking on my way home from work this arvo
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You can definitely get higher power ones 
If they are the right ones then I’m cheering cos it’s my local supermarket 
Is there a downside if I go higher than 50w/sq ft?
If you go too high you can bleach or burn the plants. I doubt you’d do that with CFL’s but I suppose you could. No need to go higher really, IMO.
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Id also look into the quantum boards for lighting. Depending on what your paying for leds, at least take a look. Hlg quabtum board.