What pointless thing are you doing right now?

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guardian452
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Re: What pointless thing are you doing right now?

Unread postby guardian452 » Tue Apr 11, 2017 5:40 am

robespierre wrote:
Elf wrote:A somewhat lengthy explanation here (from cinema, where they spend lots of money on LEDs but don't always get the results they want vs. tungsten or kino flos, etc.): http://www.screenlightandgrip.com/html/LED_Lights.html

Interesting link! I started to get a little bit disturbed by the universal mis-spelling of the word luminaires—over-zealous spellcheck?


The luminary thing may be industry slang? Like saying "mike" for microphone in the music biz when outsiders abbreviate it to "mic"... or non-computer-nerds actually spelling out the word SCSI. Or he uses speech-to-text...

He lost me at the fresnel lenses... He claims that a 650W tungesten bulb outputs 9750lm. Sure! But then putting bulb in a reflector doubles the luminous flux of the bulb to 19500 lm... I don't think that's how luminous flux works 8-)

He also confuses power factor with efficiency on multiple occasions.

But overall it is a very good writing if dated. Industry insiders are always ahead of the curve, and deal with the newest technology that doesn't have much polish on it yet. Last time I checked the "blue bump, aqua dip" is still very prevalent in phosphor LEDs but the problem is smaller than it used to be a few years ago (better phosphors). I wonder why they don't combine a typical LED with UV led hitting a different phosphor to fill the gap... understanding that such arrangements tend to not work well for point sources. Regardless, they are still getting better... but for some in photo and cinema industry LED may never be acceptable just like there are still those who only shoot film, only drive stick shift, only listen to vinyl, etc. Sometimes when you need a tungsten bulb nothing else will do. I can't imagine an easy-bake oven working too well with an LED :P (I know they have built in elements now but you get the point)...

I have also found my 580lm petzl headlight to be much, much, brighter than crappy chinese brands like streamlight and energizer that claim many thousands of lumens out of a battery flashlight. Truth in marketing is almost completely absent in that industry...

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Re: What pointless thing are you doing right now?

Unread postby Raion-Fox » Tue Apr 11, 2017 1:13 pm

I spent most of my morning and afternoon under my rust bucket Miata replacing the clutch master and slave cylinder and bleeding it. The car I bought for $2300 last summer, I've already replaced the following:

Radiator
Thermostat
Convertible top
Clutch Master/Slave
Four brake calipers
Battery
Air filter

Still needs an AC compressor, a new front bumper, a new front core support, and the rocker panels and trunk torn apart and de-rusted. When all's said and done and adding a hard top I'll have invested probably another 3-4k in the car.
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Re: What pointless thing are you doing right now?

Unread postby josehill » Tue Apr 11, 2017 2:06 pm

Anticipating root canal.

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Re: What pointless thing are you doing right now?

Unread postby guardian452 » Tue Apr 11, 2017 3:31 pm

Raion-Fox wrote:I spent most of my morning and afternoon under my rust bucket Miata replacing the clutch master and slave cylinder and bleeding it. The car I bought for $2300 last summer, I've already replaced the following:

Radiator
Thermostat
Convertible top
Clutch Master/Slave
Four brake calipers
Battery
Air filter

Still needs an AC compressor, a new front bumper, a new front core support, and the rocker panels and trunk torn apart and de-rusted. When all's said and done and adding a hard top I'll have invested probably another 3-4k in the car.


Totally worth it :) viewtopic.php?f=1&t=16730589&start=180#p7395084

But... if you skip the hardtop then you don't need the AC, either 8-)

IIRC the only thing engine related I ever had to do in my 91' protege was the t-stat (not counting distributor and plugs etc). I think very similar to your motor. (if u have 1.8?) I've had 4 mazda so far: protege, rx7, 3, and now mx5.

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Re: What pointless thing are you doing right now?

Unread postby Raion-Fox » Tue Apr 11, 2017 4:16 pm

I have a Blue '99. Nice ND.

I need A/C here in VA. Its too humid to not have A/C. If it were AZ or CO or MT, maybe, but not here :(
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Re: What pointless thing are you doing right now?

Unread postby Elf » Tue Apr 11, 2017 10:40 pm

guardian452 wrote:Sounds like you tried some cheap bulbs and got burned by faulty power supplies. I've had good luck with Hyperikon (IMO they are the best), CREE, Samsung, and Luxeon/Lumileds (for automotive). I would avoid Philips, TCP, Feit, or anything with the word "smart" in the product name. [...]

Sort of. Admittedly a lot of the dead ones were Feit, but I've had Cree bulbs go just as well. Actually didn't have too many failures with the Philips ones.

guardian452 wrote:The lighting needs for Photography/Studio use are quite a bit different from parking lot (or indeed, our workshop/office space like I am retrofitting in my spare time at work).

I didn't think about it at the time when you said highbay lights, but certainly for factory floor or parking lot use, LED is a pretty good candidate. It is also interesting to see the LED streetlights coming out. As far as replacing any of that high voltage ballasted stuff I can see why you'd want to go that way.

However for regular indoor lighting (office or home), I am quite picky about light quality. I guess it comes from doing a lot of photography and a bit of cinema, but color temperature and, to some extent gaps in the spectrum have always been very apparent to me, as well as the multiple shadows from the many point sources etc. For me, a lot of tungsten-like LED spectrum sort of falls in an "uncanny valley." It looks like tungsten at first glance, but something is a bit off, and I find it annoying. It's especially apparent when viewing photo prints or other art, but I notice it just looking at white or beige surfaces as well.

In any case I found that there are a lot of good T8 tubes that are cheap to run and have good spectrum, and using fluorescent also has the nice benefit of being a good soft light source without having to bother to bounce it off the walls.

guardian452 wrote:The sickly green 90's bulbs may be appropriate here :mrgreen: if you can find some...

Always reminds me of the Matrix. But if you can't find any, just wrap some daylight ones in some plus green gel :)

guardian452 wrote:He lost me at the fresnel lenses... He claims that a 650W tungesten bulb outputs 9750lm. Sure! But then putting bulb in a reflector doubles the luminous flux of the bulb to 19500 lm... I don't think that's how luminous flux works 8-)

He also confuses power factor with efficiency on multiple occasions.

I mostly just linked the article because I found it interesting how they were cheating on the CRI measurements, but I think those mistakes, as they are, are a confusion of theory and practice. The fresnel certainly doesn't double the flux, but you'd need a bulb with twice as much output without the reflector, if the bulb is an isotropic radiator. Likewise, especially when running on generator (as most sets do), low PF loads are effectively inefficient, as well as being electrically troublesome for many other reasons. I find that practicing electricians make many similar misstatements even if they do properly understand electrical theory.
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Re: What pointless thing are you doing right now?

Unread postby jimmer » Wed Apr 12, 2017 4:15 am

Pointless and Right Now? Well, I'm having a break and I'm looking at the Dropbox API and the docs for the FAM.

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Re: What pointless thing are you doing right now?

Unread postby pentium » Fri Apr 21, 2017 10:49 pm

The old HP RP5700 that ran my chipping station died. Had to rummage around for another box that had a physical parallel and serial port.
While I was reinstalling I also added support for reading and writing to RFID.

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Re: What pointless thing are you doing right now?

Unread postby ClassicHasClass » Sat Apr 22, 2017 4:40 am

josehill wrote:Anticipating root canal.


Ugh. And how did that go?
smit happens.

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