Yes indeed I can
Also it depends on how much is considerable, but yes there is a difference for the reasons below:
Cree does not produce a violet LED in the range of 420nm and this is one very important spectral range for pigmentation absorption (i.e Full Spectrum Leds), anything lower is UV and actually harmful to corals zooanthellea. (A highly debatable topic still)
So the LED used is the SemiLed, same with the Radion.
The lower we go in Spectrum the less visible light becomes to our eyes. However this spectrum of light can penetrate much deeper into the water and this is can seen on the spectral penetration chart below. So a 700nm light source need to be much more powerful to penetrate into water when compared to a light source of the 420nm range.
Also we don't 'see' 420nm light as bright like we see 600nm light but the spectrum show in the fluorescing of the pigmentation. For the same reason we don't see UV Rays but its intensity burns us.
So to the human eye the violet light source appears dimmer when compared with higher spectrum sources.
Hope this helps.
an extract of importance:
Note that the strongest fluorescence will be observed in 400-450nm range, particularly because the eye sensitivity in that range is very low. The light in this range is usually called "actinic light."
Surely, coral fluorescence is one of the main factors to provide a reef tank's beauty, but the light in the 400-500nm range also has other importance: it is the most optimal light to promote marine photosynthesis. Therefore this part of the spectrum is of utmost importance for a reef tank.
Charts courtesy from advancedaquarist.com
Penetration of light into seawater, depending on wavelength
Luminous function of the eye