I loaned a tank set up to a friend and I recently got it back. The tank was returned with a Coralife 10000 K High-Intensity Purifed Super Daylight Bulb in the one bulb fixture in the hood. This tank is a 20 gal high. I would like to set up a planted tank. Is this bulb the proper one for low to medium light plants in this tank? Also, I'm not sure exactly how old this bulb is or how much its been used (I do know the tank has sat unused for the last 3 or 4 years). Would it be best to just replace it and, if so, with the same bulb or would another be better?