Make sure that you read through the entire instructable before you start.
Step 1: Planning
Now you have to determine how to mount the LED's. I simply drilled holes for the LED's in the existing fluorescent mount, however your hood may differ.
Step 2: Materials/ Supplies
Wire - small gauge
Power supply (old transformer)
Heat shrink tubing
Step 3: Dismantle Existing Hood
Step 4: Mark and Drill Holes
Step 5: Wire up the LED's
Step 6: Glue LED's in Place
Step 7: Run Power Wires
Run the transformer wires into the hood through the hole you created and connect them. Make sure that the polarity is correct!
More than one hood:
If you haven't already, solder your power wires according to your wiring diagram you created before you began. Feed them through the hole you drilled in your hood.
Step 8: Reassemble Hood
Step 9: Repeat for Each Hood
Step 10: 2+ Hoods: Wire Up Transformer
Step 11: Test the Lights
If the lights don't come on, it is most likely that the polarities of the transformer are reversed. Switch the wires and try it again. If they still don't come on, then open up the hoods and check all the wires and make sure that they are all connected. Also check to make sure that ALL the LED's are wired up with the correct polarity.
Step 12: Reinstall the Hood(s)
Step 13: Optional Timer
My lights have been on 24/7 for a month now without problems.