Item #1...I've never seen a generic -50/60Hz digital/electronic ballast; that is UL 'approved'...made in China...:wtf:

Item #2...is another digital/electronic ballast that is 50/60Hz..."that passes FCC & CE'...very strange claim....probably made in China?

Magnetic ballasts are 50/60Hz...usually, digitals are much higher Hz; that overdrive most bulbs.

Buyer Beware....the ballast is THE most important part of any light system. These ballasts may work great? ..or not at all.
If they fail during a grow...game over.

The dimpled reflectors are better than smooth polished..IMO...and painting the walls flat white is an excellent idea.

$149?...you pay your money...you take your chances...Good Luck.