Match's Mods: Homemade Integrating Sphere

Seems so since he already got a lumen reading of 5000+ form his fireball wand. A good driven SST90 does not make half of those lumens ideally.

Nice easy to follow write up. Great Job! Is there any differences to using a bigger sphere like an exercise ball(more distance between light and meter). different readings?

Essentially the maximum reading of the meter will "go farther" in a larger sphere. The bigger the sphere, the higher the lumens you can measure.

Very well done, match!
You might want to study this article that I mensioned in my own IS review.

What I mean is that if the sensor can "see" the "first strike" (that is the hot spot on the wall opposite the light input) then you will get problems measuring a "thrower" light against a "flooder". If you still have the plastic dome on the luxmeter then it will be sensitive to that "first strike" and the thrower light will give a number that is too high.
The remedy is to make the sensor less sensitive to "sideways" light by removing the dome and/or make a baffle hide the hotspot.

Keep up the good work

Love it! I'm going to call it "my tape" from now on....

If it moves and it shouldn't use duct tape on it.

If it doesn't move and it should, spray WD40 on it!

I've actually seen a guy trying to fix a puncture on a motorcycle tyre with duct tape. It wasn't a good idea......

But do you know why the stuff is like the Force?

Thanks for the nice comments guys. I was worried my "art class meets BLF" may have been too far off the mark !

No, I think it's right in the center of interest. Great job!

Iwanttohaveone

Really a great job. I think i will try to imitate your IS, "Guru" Match!

Pray, tell!

[quote=Don]

But do you know why the stuff is like the Force?

[/quote]

It has a light side and dark side, and holds the universe together? Makes sense

Btw Match, what do you do in life? It seems craftsmanship "force" is really strong in you...

[quote=Budgeteer]

Btw Match, what do you do in life? It seems craftsmanship "force" is really strong in you...

[/quote]

After a failed career as a shepard, I joined the US military to work on nuclear reactors (and also picked up the nickname-Match). After six years of being a zoomie sponge, I found myself working as a project manager for a large chemical/gas company. These days I do automation engineering for a steel company...but with the added perk of getting to play "hands on" out in the shop in the dirt and grime (never going back to a cubicle). The paychecks are handy, but what keeps me coming back are the fireballs and explosions (ever see a 150MW DC arc furnace? It's a lovely lovely creature...)

(actually I only dreamed of being a shepard...I'm not what you'd call a "people person").

How high does the lux meter have to measure? Is 100,000 lux enough?

Yes. A sphere means the light is spread evenly across the inside. So unless the ball is tiny or it's a massively bright light, it's more than enough.

Thanks

http://www.amazon.com/Light-Meter-LX1010B-Luxmeter-display/dp/B000JWUT6O/ref=sr_1_1?ie=UTF8&qid=1307479229&sr=8-1

http://www.amazon.com/Mastech-Light-LX1010BS-display-Luxmeter/dp/B004KP8RE2/ref=sr_1_6?ie=UTF8&qid=1307479229&sr=8-6

If you had to choose. think it really matters?

If you're planning on building a sphere like I did, I'd go with the Mastech simply because it'll make it easier to mount.

They're actually both mastech. I have orange trim one and it works really well. The "head" on it is smaller and more precise than the other one.

thanks guys, i went with the one with the smaller sensor. Measures higher, even though I dont need it really, has a smaller sensor so I could make a smaller baffle. most importantly it has the ring around the sensor for easier press fitting. wouldnt have thought of that