I would go with t5hos or a different LED
fixture. The LEDs on these fixtures are very underpowered at 1W and no optics. The par at depth in a 40b would be abysmal. You can do far better for the money.
If you want to do LEDs, I would look at taotronics on eBay for a budget fixture.
If you want to go t5HO fish need it;lights; food;Sponge
sells some great t5ho fixtures for a really decent price. The bulbs aren't the best that they come with, but you have to replace them every 12 months anyway, so you can then go for the Giesemanns at that point