150 DE Lighting options (10, 20, 14.5, 13??)

[andsoitgoes]

This is what I get for looking at the page on my phone - Seeing this now with that info, that makes one hell of a bit of difference.

Now - what does "shielded" actually mean? From what I've understood, those are bulbs that are encased in a glass covering - right?

My only other question is that there is literally only one DE Shielded 14k bulb at 150w on this list, and most of those at the "lower" end of the scale don't actually have any CCT data.

If you go into a more common wattage, that changes things rather dramatically. For example, the G-Man 13k bulb is second from the top in the shielded ratings and actually 3 of the top 10 are over 10k...

now, the question is - if I found those bulbs/makers in 150w flavours, would I experience similar/equivalent results? If so, that just shows me where I need to go!

[fkshiu]

This article may answer some of your questions:

http://www.advancedaquarist.com/issu...004/review.htm

No CCT data means just that: he simply wasn't able to properly/accurately measure the colour temperature from the lamp for whatever reason.

The reason why PAR goes down as K-temp goes up is because most photosynthetic activity occurs around 6500K. As a result, you can't have you cake and eat it too with high K and high PAR, generally speaking. That's why people use actinic supplementation. There are a few exceptions like the Iwasaki 13K 175W bulb on an electronic ballast that has more PAR than many 250W bulbs.