wattage question

Unfortunately I do not have a top of the line grow setup. I am on a limited budget and am a first time grower. I currently have a 60W CFL with like 1550 lumens for my seedling. This is the highest I could find in my area. My question is can I buy a 2nd or 3rd light bulb and will this be equivalent to me having 120 or 180 W on my plant. the plant looks like it is coming along nicely, but I am striving for maximum quality and yield. If getting a 2nd bulb is not a great idea than can someone direct me on what my best course of action should be, if any. Thank you!
 
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