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LIGHT QUESTION >> AGAIN



first of all sorry for this question again ... i know its been
discussed many many times before ..
ive only one question :

	Which has more punching power .. meaning for a tall
	tank .. which can reach the bottom beter .. 
	125 watt Mercury Vapour or a combination of flourecents
	its a narrow tank only 20 inches .. wide and 5 ft long ..

LIGHT GURUS PLEASE HELP ..
TIA
MIKE