A while back i bought some 530 halophosphate 8w fluorescents from CP Lighting. When looking at them through a spectroscope, i noticed the spectrum wasn't quite like i'm used to with color 29 (530) halophosphates.

Now i have the spectrometer, we can see that the phospor is... Weird. It is a mixture of triphosphor AND halophopshate it seems. It has the big yellowish bulge associated with halophosphate lamps, but also the red, green and teal peaks associated with triphosphor lamps.
It is in a fixture with a plastic cover, blocking the little UV peaks.

Yet, they are stamped color 530 - low CRI. I wonder, why would they mix these two, and not choose one or the other? Is it like... Recycled phosphor?
If no one here knows, i'll send an e-mail to CP lighting. I wonder if they even know, heh. I still have to figure out the procedure to measure CRI with the Little Garden spectrometer. Perhaps they'll have to bump up the 530 rating to 630 or 730. I'm now also gonna get the 630 'Furniture White' flurorescent lamp that was sitting at a thrift shop. Might be the same phosphor blend, who knows. Hope it didn't get sold...

2nd attachment: 33 (640) actual halophosphate, for comparison. Has more blue colors of course. Lacks the extra emission in the green, the red, and maybe teal.

Second puzzling thing (3rd attachment): i bought an Osram 33/640 in the DIY store. I assumed i was buying one of the very last halophosphate lamps on our market.
Well... Seems like that's fully triphosphor! I have yet to measure the CRI, but it would be really odd if it were some highly specific low CRI triphosphor mix.

Finally, 4th attachment for comparison, an Osram 827.

Ha, I swallowed the hype and ordered that Chinese wonder, Little Garden spectrometer today too. Just could not resist for $62 shipped Spectral resolution looks rather good at such cost! Let's see next month...

Btw, have a local brand 40W circline here, mostly halo spectrum, but showing a little peak at ~611 nm typical for rare earth red. Not sure if it was just a coating machine not cleaned well enough, or was RE phosphor deliberately added to make CRI slightly better.

I know about the halophosphors tube with the red line in the spectrum. I don't know what it is, but it isn't YOX, as YOX have several lines in the red in additional dimmer lines in the orange.

But weaker lines of YOX are swamped in halo's continuous spectrum. At ~611mn it *should* be something europium in my lamp, not much choice. YOX or vanadate. You may have seen an old-school deluxe halo mix, it has fluorogermanate, with a peak at red, but much more deeper, about 658nm.

Ha, I swallowed the hype and ordered that Chinese wonder, Little Garden spectrometer today too. Just could not resist for $62 shipped Spectral resolution looks rather good at such cost! Let's see next month...

Btw, have a local brand 40W circline here, mostly halo spectrum, but showing a little peak at ~611 nm typical for rare earth red. Not sure if it was just a coating machine not cleaned well enough, or was RE phosphor deliberately added to make CRI slightly better.

very interesting on that spectrometer! I just watched a couple Videos on it, and it sounds very tempting indeed, I look forward on hearing how you get on with it or anyone else for that matter, especially when it commes to CCT and CRI calculations also