I use ReptiSun 10 both for my 4-5month old Pastel bearded dragon, & I also use a ReptiSun10 for my Normal 4-5month old bearded dragon.
& I JUST TODAY got a new, beautiful, amazing Dragon. A Red. Brown, Belgium with Blue bars & a nice light blue color inbtwn his patterns which you can see veryyy easy! Hes A Hypo/Het Transulent/Leatherback. Hes only 5weeks old & 6inches, I got it from Dachiu. But atm the only other UVB that I have was the Desert Coil Bulb. Which I know isnt a safe bet, but I talked to Mike the owner of Sunshine Dragons, & he said he uses them with no problem, so I guess Ill continue to use it till I can afford a different one.
They never close both eyes at the same time for a long period of time, if anything they will squint there eyes, like there relaxed but not close them. Just sometimes when there basking there keep one eye open & one eye closed for only a minute then open the eye thats closed. Only time they close both eyes is when its bed time. I'm not to worried about it, I don't think its anything bad, well I hope not, I just didnt know if theres a genetic reason or personality trait reason they do this.
With Beardy's it's all about Trial & Error. Everyone of them is different