Using 28w instead of 54w T5?

[AnA]

Recently, I visited selffix and found these 28w daylight T5 from Philips. Decided to give it a try.

I know a 28w will never compare to a 54w tube in term of light density. But, I would like to give it a try and see how my plants react. Since, I planted mainly moss, it should not be a problem. As my Osram's eBallast could support varies wattages tube, why not take advantage of such feature and save some energy. Also, at 28w, the eballast should run cooler as compare to running at 54w. I have yet to confirm this. But, logically should work that way.

[AnA]

Previously, before I change to 28Watts T5 6500k tubes. I was using 2x 54W HO 6500k T5. Now, I am using 28W x 4 for my 4'x2'x2' aquarium. Although in term of electrical energy; there is no saving. But, I still change it just for the below 2 reasons :

1) more evenly light distribution for 4 tubes versus 2 tubes.
2) cooler eballast operating temp. (each eballast only powered 2 x 28w as compare to each eballast powered 2 x 54w tubes). Thus, the ballast life span will last longer.

Also, one good advantage is that the colour of the fishes seem to enhance. I think the slightly weaker output of the light somehow make the body colour richer and does not fade the colour of the fishes as compare to stronger lighting. Will see how does the plants react to this new lighting.