Need to replace my lamps in my 75 gal. with 4' lamps. Should I buy them at my LFS or would some F40CW cool white lamps from Lowes suffice? Are the LFS lamps all that? The F40CW are the standard lamps in office light fixtures. I just want the best lights for my money. $24 vs. $5 makes a difference. What Lowes lamps would you suggest if that is your choice?