The original tropical lamp t5 is designed specifically around the red and blue wavelengths in daylight that are necessary for photosynthesisthis give a warm pink light that encourages plant growth and highlights the iridescence of many tropical fishr the spectrum created also has the effect of highlighting the fluorescent features of fish such as neon and cardinal tetras platys and guppies bringing out and enhancing their highly attractive natural colours making them appear to shine even mo