First timer with LED, yeild questions.

I am a first time grower, and i have a question regarding my yeild. Basically, I want to know if my buds look the correct size for their current stage, or should i invest in MH/HPS in my next season.

Here's my setup:
2x2 DR60
4 fans (1 in every corner)
Apollo Horticulture 180W LED Full Spectrum + IR
- http://www.apollohorticulture.com/LED-ufo-180w.html
Dehumidifer, RH never reaches above 50%
My plants:
Fire OG
Gorilla Glue #4
I started flowering both at 8 inches.
Both in Fox Farms soil and Tiger Bloom nutes.
Both are on day 38 flowering

Side question, i've read buds swell in the last two weeks, but how true is that?

no one will have a straight up answer for yoru question Amigo.

Myself I went ahead and bought soem of the top notch lights Two years ago (gavitas lights) and I can tell you that the lights are 50% part of the success on your yield, the other half is all depend on how well you feed em, and the strain you working on currently. I grown several strains under my lights and the only one i wont go ever again is the GSC, is low on yield and to delicate when it comes to heat. i nthe other hand, GDP, Chem dawg are one of my best yielders under scrog or none scrog, easy a pound per plant (vegin a plant for 7 weeks).

LEDS work well so you should get good results.!

Keep us updated amigo,

-Jugz

They look right for being under low power. Yes, buds swell 10-20% in the last few weeks.

If youre not willing to invest $400+ in quality, efficient LEDs, I'd recommend going the hps route to get a good yield.