Okay, that's weird. I couldn't see your photograph until I hit the reply button and scrolled down!
Anyway, I'm not a lighting expert but I think bulbs that are aimed specifically at growing plants tend to peak in the blue and red parts of the visible spectrum, hence they can lean towards a purplish/pinkish tinge. This may be why it appears duller to you because you have it next to a light peaking in different parts of the spectrum that to the human eye appear brighter.
So, assuming that you have the correct wattage light for your fitting, what you have is "right", but you may not
like the appearance of it, either because it is in juxtaposition with a very different light (so getting a matching one could make it look a lot better), or because it simply isn't a pleasing effect for you.
I've had my own decisions to make about lighting because I hated the Juwel "warm" light supplied with my tank - it made my lovely green plants look horribly yellow - so I replaced it with a daylight lamp and am now happy with it. I've also had bulbs that were just too pink, too blue, whatever - yeah, I'm fussy
- but at the end of the day, you want something you enjoy looking at or there isn't much point (or not for me, anyway!).
I hope that helped a bit.