How many lights should I buy?

[Daniem]

I'm a totally newbie and want to buy this light on ebay, please look at the parameters, it suits for small tent which just able to grow two strains? How many lights should I buy? Anyone has bought one like this before?
LED grow light HY-MD-D169-S

 

[Mars Hydro]

You can check on our Mars Pro II Epistar 160: mars hydro led grow light-Epistar 160S

 

[Kalimaki420]

No that is not enough.

look for Mars (Reflector) or Timber LED with 160-200W real usage.