That's perfect my man. You're gonna love it. I think I would need six of them to go full coverage in my room. Can't afford that all at aonce for sure. I might be able to get one or two a year and use them as side lights. But as you say, the electric costs! holy crap my bill just came and let's just say it's scary.. My plants are swimming in HPS light and growing into the roof though. I am rolling the blurples out for the next grow, should be a great comparison.
I am still thinking they have not caught up unless it's the new COB's, but it's hard to say till I do a comparison run in my new climate controlled setup. But one thing I know for sure, the girls I have under HPS are praying like no other plants I have ever grown. I never saw this with the blurples.