double ended mh bulbs vs screw in type

[Samw]

Originally Posted by BrainVat

Zooxanthellae use a number of mechanisms not available to plants to harness light energy from other portions of the spectrum. These include, but are not limited to UV-A rays, and are responsible for the rich coloration you see on your corals.

If we were only concerned with the PPFD over the PAR region, then we might be tempted to think that 6500k Iwasakis (189 PPFD @ PAR) are more desirable than 20k Radiums (85 PPFD @ PAR). Try it out for yourself, and you'd find that the corals under the Iwasakis generate xanthophyll pigments to protect themselves from the heat transmitted by higher wavelengths. These give off a rust brown color however, and we tend not to prefer this "look" on our corals. (Though do use lower temperature bulbs on the grounds that the corals receive more PAR light.)

This is why when I argue that DE bulbs generally give off more light, I only speak of raw intensity. Its final effect on coral growth, presentation, or other subjective visual tastes are a completely separate matter to me.

So when you asked us to look at this graph in your first post, what are we looking at here that shows DE gives off more light?



What are you using to measure intensity? I always thought Iwasakis were more intense which is why growth was faster under them.

So are you saying that Sanjay is wrong when he said "Comparing the data here and other 250W DE articles with the data for 250W Mogul lamps, should provide enough factual information to dispel the myth that 250W DE lamps produce more light output than the 250W single ended mogul lamps."

http://www.advancedaquarist.com/issu...04/reviewb.htm