I'm interested in using an Eclipse filter on my 29 gallon soon-to-be planted
tank. Can it handle lights strong enough to provide 3 watts per gallon? Or
has
anyone had experience with retrofitting it so it can?

I would say an Eclipse is not a good choice. It won't provide enough light,
and the biowheel will dissipate the CO2 you're injecting. (You are injecting
CO2 with your planned lighting level, I hope.)

A 29 gallon is also not a good choice, IMO. It's very high for its volume,
meaning the lights are far away from the plants.

Don't get me wrong, you can work around these issues...but you're making it
more difficult than it needs to be.


Leigh

http://www.fortunecity.com/lavender/halloween/881/