Leds or other light sources means little.
No light source is better than another in general.
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Watts is a measure of the juice your LEDs use on most data sheets.
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Though most people think Watts means something other than what is advertised.
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IF all LEDS put out the same light/lm. Â as other sources PER WATT ,
Then watt or whatever would mean something.
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I have 1 watt leds putting out up to 80 ln. and 3 watt ones putting out a max. of 35lm.
I watt 10mm leds I have put out even more Lm. 100 or so.(but in only certain NM.).
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Mostly in nm. I can't get from 1 watt stars,in mostly orange NM. and low blues.
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Your pics look like they are really yellow like halides are.
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If they are white LEDS in 5000K to 6500k they will be like using fluoros +/-.
More Lm but the same wave lengths.
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Looks like you are using between 3000 and 5000k.
I see a different group as 4000 to 6500K.
Depending what you have the lumens can be VERY cool in thenm needed for peppers.
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Acording to the cree site.
I think you screwed up unless you have 3500k or higher Leds for peppers.
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For me,any light source should be 5000-6500 k that works good for peppers.
The lm. rate looks great in general on the data sheet...
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I only grow peppers.
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Peppers will grow great under all 400-470nm and  or 625-670nm LEDS or both combined.
They aren't light specific in general as far as growth and fruiting goes.
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Those LEDS do kick out the LM. according to the data sheet.