Was just chatting with one of my students in lighting as it were about similar concepts today as with constantly explaining the low pressure
sodium vapor concept for TBA lighting
effect to a show brought up again for it’s white/black light
effect in washing from the
stage any color and making the audience sick given the quote for the fixtures didn’t include dousers in shutting them off after the
effect... Last time the LPS
wash lights were tried, they were turned on once and instantly sent back - gee, that’s powerful.. Just ain’t gonna work for this show. A year later LPS fixtures were tried again for a different show and... gee, this aint gonna work. Third year, got my quote out for two versions of them due by the 14th of next month. Designer is still considering giving the “go” this given he just timed out on three to four week lead time in getting the ballasts and reflectors for the Sportslighter assemblies with two 90w LPS lamps horizontally cut into them. We
call them the “Franken
Fixture” because it does dire things to you if you stand under the light too long, and the
wash light itself - like a
scoop with two huge tubular lamps horizontally speered
thru them plus assembly for mounting don’t look ergodynamic.
This tonight more about
LED flash lights - I
call LED’s fake light in that they don’t give you the full spectrum of light and reletive brightness is only a
color temperature trick similar to how a
Mac 700 with a 7,500°K lamp seems as bright as a
Mac 2K with a 6,000°K lamp. This given the concept of the
HPL/HX-600 lamp theory of as bright as a FEL is true but in actual luminous output (beyond
filament efficiency), it is more like a 800w not 1,000w lamp. It’s the
color temperature and especially
color temperature of a 115v lamp verses that of a 120v lamp which makes it seem as intense as the clumsy filiment type FEL in wasting a lot of output where it won’t get out of the
fixture also, but mostly the
color temperature fooling the eye as being brighter. Not persay more light output lamp to lamp (better optics help also after that.)
Got a few
LED and
fluorescent flash lights and mostly still
halogen or
incandescent ones I use dependant on the situation. Mag Light
halogen I'm all about still in never going
LED source for it. If I’m inside a AC
distro in looking at the wires, it ain’t the
LED one I’m going to choose so as to see the color of the wires I’m
tracking down, it’s the full spectrum
incandescent I would choose in true color
rendering.
LED lamps “seem brighter” mostly it’s just a higher
color temperature in a similar way to why the 575w/115v HX-600 looks as bright as a 1Kw FEL lamp. Or the
Mac 700 at 7.5K looks in output as bright as a
Mac 2K with 6K in
color temperature. Tricking the eye in being brighter as it were. This and especially more the concept that the
LED lamp ain’t putting out a full spectrum of light.
Bit less say in the red/yellow range of just spikes of color rather than full spectrum than blue thus a yellow or was that light blue
wire might look white and that’s important to see in difference. In the case of the street lamps, it's the lower color temperatures that are in
effect in not really highlighting the blue ones. But on the other
hand, look at the rods verses cones night
vision arguement below for counterpoint. It ain't an
incandescent clip light I would choose while inside the rack, it's
fluorescent or goose neck
LED in them other resistantance sources during especially the summer without AC, it getting hot, though if
tracking down wires I would be
incandescent source.
Just as I don’t like compact fluorescents,
LED’s in that they don’t give out the full spectrum of light. Both constantly getting better in attempting a better
CRI, but if choosing a clip on
book light say in reading at night, one still wants a
incandescent,
halogen or
xenon lamp for it. This much less if one is to be under such a light hours on end and especially as task lighting, I would avoid
LED’s the same as the article says in concept about street and building lighting. This higher
color temperature verses lower
color temperature difference noted in reverse of it but for similar reasons.
Switched the storage building to
metal halide retrofit lamps years ago. Two choices in them, one with a higher luminous output, the other with a higher
color temperature. I checker boarded the place for concept though that in the end didn’t happen. Still both had better Color
Rendering Index much less it’s just plain brighter.
On the other
hand, were I to fight for the other side, I would argue in what was not pointed out by the article in night
vision. What was it cones or rods that are in use for night
vision. Which ever they are, at night when they are in use, you ain’t gonna be able to see that full spectrum of light anyway so there might not be a problem with the lamps in use. Our bodies are not attuned to it at night. This given what is it dark sky syndrom which is about people needing full spectrum light which is important. Spend a full day in the theater day after day under say
LED or
fluorescent and leave at night with the sun down and you gonna get sicker more than if under natural or
filament lighting as a proved concept thought.
