my grow tent kit ive got a spare light should i add

this is my set up


The new 2010 tent is a DS1.2m x 1.2m x 1.8m and has the following specification:

• Light proof washable material​
• VERY SHINEY MYLAR LINEDfor maximum light reflection (much more reflective than tents with white insides)​
• Light proof washable material​
• Top support bars capable of carrying 30kg (for lights, filter etc...)​
• Assembles in minutes with no tools needed​
• Adjustable vents for inlet and outlet fans​
• A quality tent made by 'Secret Jardin' (not an unbranded import)​

This tent comes with:

• 1 x 600w complete grow light quality Maxibright ballast, Sunmaster Dual Spectrum Lamp and euro reflector)
• 1 x 100mm Vents TT inline extract fan
• 1 x 100mm carbon filter (STOPS ALL SMELLS)
• 5m x 100mm flexible ducting
• 3 x ducting clamps to connect fan to filter and otlet all together ( other supppliers do not include these )
• 1 x set of easy roll light adjusters to hang reflector from
• 1 X plug and grow heavy duty timer (The only timer you can buy capable of switching upto 600w HPS or Metal Halide lamp without the need for a seperate contactor unit

they send me 2 of the 600w complete grow light quality Maxibright ballast, Sunmaster Dual Spectrum Lamp and euro reflector so should i add the second 1 will it be too hot im only grow 5 planets but heard the more lite the better
cheers!!!

I wondered if you ever got an answer. I have a 4'X4'x7' grow tent (about the same size as the one you set up) and am wondering if a second 600watt light would be too much if I put a second 600 watt light in. I have a 440 cfm exhaust fan to circulate air and cool.