Here’s the pic I mentioned. I was first tipped off that my HS1010 was grossly in error when trying to measure throw of my modded Courui.
I bought my LX1330B from a guy on Ebay shipping from MD. He had 300 of them selling at $18 including shipping. Not sure if he still has any. Guess I could check.
EDIT: The Ebay guy still has some but changed listing price with separated shipping. Still about $18. I’d jump on these if your looking for a luxmeter!
I’m also interested in getting in on this. My concern is getting the most accurate reading from a wide range of lights. So what if we do two sizes and two separate calibrations? One for small lights and one for large lights? This may give more accurate readings and more options. If someone just needed the small one they’d get it. Then later if they needed a large one they could purchase the parts and just recalibrate?
What! No NIST Cert! OK Maybe calibrated is to strong of a term. No doubt though it will be more accurate than what I was going to cobble together. It would add some credibility if a reviewer tests lumens with a BLF sphere that is widely used and accepted.
SawMaster, yes we need to increase the size, however like the link you posted, they get spendy fast. That one you posted is $22 for 1 sphere before shipping. Keep looking though.
By the time there is a prototype the parts will be delivered. Sure I will post the first build for comment, but one or two more interested people won’t trigger a whole new production run. You could be waiting a while for batch #2.
Ran out of time today but a quick ’oogling shows several sources at around $10 per half ball ($20 per sphere). I will dig deeper tomorrow and find best prices as well as possible international marketers for same.
Two pitfalls to watch for with the balls: Some are made from coarse foam for floral arrangements which will not be suitable- we need smooth, dense foam. Also remember we are looking for an internal size approximately 10” to 12” (254cm to 305 cm) and most balls advertise only the outside sizes.
