Does the current hood with PC fixture include any cooling fans? If so you can easily throw a few multi-chip LEDs on appropriately sized heatsinks in there. All kinds of them available on the net these days, including multi-chips with a white/blue mix on the same chip. Strips are also a good option, depending on the type of livestock you're keeping. They can be pretty much plug & play, with silicone covered, water resistant/proof options available.
Link to my own DIY effort is below.
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