Opinions on these chinese LEDs

[425nm]

I would be warry of any LED ballast that uses a shotgun approach. Notice how the higher end ballasts usually have 6-12 LEDs rather than >100. This is because higher quality LEDs are more precisely stunned to the wavelengths needed for coral grow so only a handful are needed.
If you're after budget LEDs check out the TMC ballasts on J&L Aquatics. They cheaper and not crap like the Chinese brands. Also give this a read:
http://americanaquariumproducts.com/..._Lighting.html
It explains pretty well everything about lights you need to know.