Steve Tyree's chat the other night

[stephane]

Originally posted by StirCrazy:
but the Ab bulb will still lay waist to any 250 watt bulb out there :D but, this is not the important thing. the fact is that a 150 watt AB DE bulbs seams to provide Iwasaki power with a 10000K color and that its effectiveness is some where between a 250 and a 400.

[/QB]

<font size="2" face="Verdana, Helvetica, sans-serif">NO! NO! NO! Stir dont forget AGAIN that the mini DE reflector concentrate the light in a small beam dont compare a 250 iwasaki whit a 150 DE the 250 will sipmly blow away any 150 in SIMILAR reflector put the 150 DE in a spider and then you could compare other than that any comparison is useless and false

This is a tread from the mouth of of sanjay imself maybe now it will make the ting clear

Originally stated by Sanjay Joshi:

quote:
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Hi,

Just thought I should respond this discussion, especially relating to the 250W and 150W DE 10KK lamps.

The 250W lamp was tested without any reflector, whereas the 150W was tested in the PFO mini hood. When testing these lamps without a reflector, the lamp is basically sticking out with absolutely nothing on top so no light emited from the top is reflected in the downward direction and almost none of that gets measured - since the test is performed an a room with walls painted dull black and really high celing. Since all the tests were performed in a similar manner, this allows direct comparison of the lamps against each other.

However, when a reflector (or in the case of the 150W the mini hood) is thrown in to the mix, the data cannot be easily extrapolated for comparison. To use 50-75% increase due to reflector is most likely not correct, since in the case of the mini hood most of the light was being reflected in a downward direction and hence being measured, and throwing off the comparison based on extrapolation of the data from the 250 tested in a very different manner.

[ 07 June 2002, 21:23: Message edited by: stephane ]