I failed to make a usable light for my tank from high wattage LEDs, so now I'm trying to make one from low wattage SMD LEDs, supplied as self adhesive tapes. I have ordered the LEDS, at least the white ones, from Ebay, and have purchased the aluminum for the heatsink from my local surplus metals dealer, and have started to build the heatsink. Here is the design: (showing a cross section.)
Notice that my LED light calculator program indicates that this will work very well, but that program isn't based on the SMD LEDs, so the result may vary considerably from the calculation. Much more to follow.

Notice that my LED light calculator program indicates that this will work very well, but that program isn't based on the SMD LEDs, so the result may vary considerably from the calculation. Much more to follow.