cheap light

would that be good for a ten? 10 gal?

Should be - depends on what you want to keep. Might want to do two on a ten. You'd be good for zoos, mushrooms, trumpet and candy cane corals - probably most things but the most light demanding corals....

i'm so confused. isn't that a 75 watt bulb?

no.. it is 75w output but is a 19watt bulb

19w is the power comsumption of the PC bulb. 75w is the output of the bulb compared to an incadesent fixture.

It's only a 19 watt bulb - just puts out a lot of lumens per watt. Incandecent bulbs are very inefficient and don't put out a lot of lumens per watt. For a 6 gallon nano - these bulbs work very well.

huh did know that