Steve Tyree's chat the other night

[stephane]

I quote part of the study from Steve Tyree

quote:
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The Iwasaki 6,500 K is the only bulb classified as a Full Spectrum Green bulb. This bulb emits the highest percentage of its light within the green and yellow parts of the spectrum. It also emits significant amounts of violet, blue, orange and red light. About 60 % of the total light emitted by this bulb is either green, yellow or orange light. That type of light is not primarily absorbed by the chlorophyll and peridinin pigments within the algae.
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Freeking no.... if we refer to this in fact the iwasaki is bright but 60% of is light is not absobed by the coral. So in fact 40% is the only part that are absobed and the 60% rest is only there to make the coral look less colored (if I understand well)

quote:
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The Radium/Osram 20,000 K and Sunburst 12,000 K are both classified as Super Blue bulbs. Super Blue bulbs emit the vast majority of their light within wavelengths from 440 to 460 nm (high energy blue). They also emit small amounts of violet and green light. The narrow emission of this bulb happens to be located within an area of the spectrum where chlorophyll_a, chlorophyll_c2 and the peridinin pigments can absorb and utilize the light. The vast majority of the emitted light energy from the Super Blue bulbs is photosynthetically useable by the algae. These bulbs can actually benefit from a boost within the violet area of the spectrum. Most aquarists however will be adding daylight fluorescents to counter the very blue visual appearance of the bulbs. These bulbs will intensely stimulate the blue, green and yellow fluorescing pocilloporin pigments. Red fluorescing pocilloporin will be moderately to strongly stimulated. Super Blue bulbs only provide a weak amount of light that can be absorbed by the pink pocilloporin pigment. The 400 watt version of the Osram/Radium and the 250 watt version of the Sunburst lamps are both useable for shallow water stony corals.
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That why if I understand well even if that lamps look more Dim
all the light that it produce is absorb by the coral. Suplementing this bulb whith an Iwasaki is not very the best you could do and the best supplement to it could be an Ushio to boost the violet but but it is not require if Im right again

Finaly

quote:
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The Ushio 10,000 K and Aqualine Buschke 10,000 K are Full Spectrum Violet bulbs. The spectral output of these bulbs is characterized by a large emission of violet light along with a secondary emissions of green, yellow and orange light. As Sanjay Joshi noted these bulbs trick the human eye into thinking there are emitting significant amounts of blue light. The significant violet light emission will provide plenty of light for the chlorophyll_a pigments within the algae. These bulbs will really benefit from supplemental blue light. Full Spectrum Violet bulbs will moderately stimulate the fluorescence of the green, yellow and red fluorescing pocilloporins. They will strongly stimulate the fluorescence of the blue and linked red fluorescing pigments. These bulbs only provide a weak amount of light that can be absorbed by the pink pocilloporin pigment. The 400 watt version of the Ushio and Aqualine Buschke are acceptable bulbs, while the 250 watt version of the Double Ended HQI and Aqualine Buschke are also acceptable. Actinic bulbs or Super Violet bulbs are best used as supplemental lights for bulbs that are deficient in violet light emission.

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If Im right those 10k bulb are not realy the best and need to be supplement by super blue light

So my conclusion here is that the best light you could have by there own is the radium or even a sunburst but the sunburst are dim

The best Combo could be Radium or sunburst + Ushio or AB 150W

If I stick to Steve we do exacly the oposite of what he clame we suplement whith blue he said
get blue and supplement whit small 10k :confused: