Quote:
Originally Posted by ScubaSteve
The problem you are describing is called colour separation and is due to the distance between the different colour emitters. Since the emitters (LEDs) of different colours are shining on the rocks at different angles, you end up with multicolour shadows and thus the rainbow effect. This is a fundamental design flaw that you can't do a whole ton about. Taking the lenses off makes the light less focused, which blurs the different colour shadows together a bit but there is another solution you can try. Look for a transparent, light diffusing film (slightly more transparent than a frosted film). This will help blend the colours together and give you a 'flat' light look like what T5s give. This will cut down on the output a bit, but you can turn the LEDs brighter to compensate.
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+1 ^^^^^^
This is why you'll see the high end fixtures (Mitra's etc) and good DIY fixtures with really closely laid out LED's in clusters rather than an evenly spread layout.