You have many options for lighting.
DIY is a very good option.
CMH is another good option.
I run 300w LED in a 2x4 and it costs roughly $20 a month in power. 600w will cost double that. It’s a good idea to consider long term energy costs rather than just the cost of the fixture. This assumes my math is correct 
Seeds are a matter of personal preference. Grow what you like to smoke!
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