New lighting tests. Interesting resutls. as per usual.

[DJ88]

You can read about the test more here.

Reef Central Thread

[ 17 June 2002, 15:48: Message edited by: DJ88 ]

[stephane]

tink this confirm what I always claim on the DE bandwagon and get flame by

Even If look manufacturer spec the lummen of single ended are alway as good as DE of the same watt.

a 150 watt is a 150 watt and a 250 watt is a 250 watt no comparison possible IMO

I wait to see the AB test now

Tank Darren to get this tread here I was waiting
for it.

[ 18 June 2002, 07:16: Message edited by: stephane ]

[StirCrazy]

haha, your funny Steph :D the DE's that were tested are "Blue bulbs" if you read it again.. so that is comparing something like a 20K DE against a 10K SE.. but it was a nice try [img]smile.gif[/img]

Steve

[ 18 June 2002, 18:50: Message edited by: StirCrazy ]

[stephane]

Originally posted by PerryinCA
Sorry about the confusion....

That was a data input error. My Bad. The 150w lamp from Ushio id the "Aqua" Model, also known as the 10k.

The rest of the data will probably not be posted until tomorrow morning.

<font size="2" face="Verdana, Helvetica, sans-serif">

Sorry steve but Perry made an herror at first
Hushio dont made blue bulb it is tag on BLV colorlite :D

The ushio is a DE 10k Sorry to disapoint you :D
anyway I tink we have to wait for AB but suspect the same result ;)

[ 18 June 2002, 20:10: Message edited by: stephane ]

[DJ88]

You beat me to it Stephane!!!

;)

hee hee

[StirCrazy]

hehe, ok.. never heard of the "aqua" model but I will beleive ya :D

anyways I think you will be surprised by the AB if they ever test it, not promissing anything but just a hunch I have... hopefully they test it soon I am getting curious.

I hate it when people test at 3", it makes the numbers seam so high LOL ( what formulae would I use to convert the 3" results to 18" results)

this test does show some interesting things though.. acording to this the DE 1000K Ushio 150 watt puts out a very small amount of UV a/b compared to the Ushio mogual 175 watt and 250 watt bulbs which would sugest that it is perfectly fine to run SOME DE bulbs with out glass.. hmmm that means if you could make the reflector right you could have a very compact MH bulb in your hood.

Steve

[DJ88]

what formulae would I use to convert the 3" results to 18" results

<font size="2" face="Verdana, Helvetica, sans-serif">Drum roll please.

From Sanjay's site about MH testing that YOU posted in another thread. :D

Do you ever read any threads Steve? ;) hee hee. Kidding. :D

The Inverse Square Law-
Being a point source of light, as you get closer to a MH bulb the intensity increases at a rate of the square of the distance. In the tests performed to get the above numbers the distance from the sensor to the bulb was 18 inches. As bulbs are placed closer to the water surface the PAR numbers will increase dramatically. If the bulbs are placed at 9 inches above the water multiply the above number by 4 (eg Iwasaki 400w 173 x 4= 692). Move them to 6 inches and you can multiply by 9 (eg Iwasaki 400w 173 x 9=1557). This particular bulb is approaching natural surface values without even using a reflector.

[StirCrazy]

on another note there is a suspision arizing that the results of this test could be bogus. Steph let me make this clear befor you start arguing with me I AM NOT SAYING THAT THEY ARE...

I am only saying that there are some very valid points that have been brought up about the effect of heat on the PAR sensors. as it has been stated in the original post I think a retesting at a distance of 18" would be the best thing Dana could do, but we can only hope this happens.

Steve

[DJ88]

Steve,

Just apply the math with the inverse square law.

Light decays as you go away from the source by a factor of the distance you moved. In Air that is.

Take the 3" measurement as a starting point then use Sanjay's definition to find it for 18".

Easy as that. Just a bit o math is all.

[StirCrazy]

26.4 ... this is the number to convet 3.5" to 18" damn and I was trying to ba lazy tonight also.. :D :D oh well wasn't that hard.

Steve