Quote:
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Originally Posted by BrainVat
Quote:
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Originally Posted by Samw
Its a myth that DE lamps produce more light than SE lamps.
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Not entirely. For example, comparing a radium SE to an XM DE shows that the SE bulb gives off more light. But within a given brand, it's most often the case that DE bulbs produce more light than SE at the same wattage. This is the case with XM lights and also true for Sun Aquatics lights with the exception of the 10k series.
Try formulating intra-brand comparisons with sanjay's data to verify that this is true.
http://www.reeflightinginfo.arvixe.com/select2lamp.php
By this data, the myth seems to be that the "rule" for DE vs SE is true for all bulbs in all cases. More accurately, it is a simple general guideline for a given brand name that has some exceptions. |
If you look at the graph that you quoted in your first message, you will see that the XM SE produced more light than the XM DE. The same goes with Coravue lamps. The same goes for AB lamps. The same goes with Ushio.
The myth is that DE produces more light than SE bulbs and the data shows it. I'm not the only one saying its a myth. I quoted it from Sanjay's website that you are asking me to look at. The numbers show the SE lamps having higher PPFD. Even your example shows the the SE bulb of the same brand (XM) has higher PPFD.