Too Bad. For the money was probably no longer be expected.

Luminous efficacy - Well, high self-blinding by a transparent ring at the top of this -klebt one with black electrical tape you can see 80% more and is no longer self-blinded.
The brackets and retaining lugs - are very frail, or canceled after a short time.

CONCLUSION:
It is probably still better to invest in something good once,
rather than repeatedly in poor quality.