confused by laser watt and maxium current

i bought 1.6 w 450nm blue laser diode (osram) from ebay and I now confused by maximum current my laser can handle. in the datasheet it says you can put 1.5 Amp maximum current with typical 4.8 volt for maximum operate but my blue laser is 1.6 watt. if the formula for watt is p = v*i so my laser must be 4.8*1.5 = 7.68 watt laser or the term watt and power is different from above formula?:thinking:

link of datasheet:
http://www.osram-os.com/Graphics/XPic1/00088311_0.pdf

sorry for bad English.
thanks.