increasing light intensity with the same fixture?

[piaba <piabinha at yahoo_com>]

hi,

for my 29 gallon and 10 gallon tanks, i use the
regular one-bulb fixtures (20 and 10 watts,
respectively).  is there a way to increase light
intensity with the same fixture, i.e., are there light
bulbs in the market that can give out more light with
the same wattage?

tsuh yang

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