Same question, different lamp: Philips CPO-TW. The lamp voltage again roughly corresponds with that of a SOX lamp. And again, Philips has a specific driver for it.

In this case, drivers are still available. But the 45w driver costs over 90 euro. The drivers for higher powered lamps are significantly cheaper (17,50), but those are much too bright to operate in my house.

Does anyone know what the difference is between the Philips HID-DV PROG Xt 45 CPO (for the CPW-TW lamp) and the Primavision SON/CDO 50 i already have?

You can google lamp data (voltage/current) for both lamps and compare.

I often search for these specifics using the lamp’s part number followed by filetype:pdf to get the best results.

You can google lamp data (voltage/current) for both lamps and compare.

Oh i know, but for instance for the SDW drivers there should be some difference in the drivers, despite it (for now) working fine on a SON ballast.

@Laurens
According to this site:
https://www.docs.lighting.philips.com/en_gb/oem/download/cosmopolis/MASTER-CosmoWhite-datasheet.pdf
Your 45W lamp has a voltage of 91V and a current of 484mA. This is very different from the characteristics of 50W SON, which has a voltage of 85V and a current of 760mA.

Unfortunately, this ballast combination is probably going to overdrive the lamp pretty severely (assuming my specs are correct).

Here is a user that runs a Philips Cosmowhite CPO-TT 90W Extra on a 100W HPS gear: https://www.youtube.com/watch?v=7lWFXWC63pQ

So what is the point? Pretty anyone can run a lamp on a wrong ballast and flush this to youtube...


My guess is if CPO lamp is run on a standard electronic MH ballast of close wattage (50/100W) it will be overdriven by about 10-20%.

Specs are somewhat entangled for them. While for CPO lamp 91V*0.484A = 44W is almost exactly lamp design power, for 50W HPS/MH lamp 0.76A*85V=65W which is way higher. I guess this is because CPO is specced to work exclusively on squarewave e-ballast and power factor is close to one, regular HPS/MH lamps are originally specified to run on 50Hz choke at sinewave, so lamp power factor has to be accounted. 

That last bit makes the most sense. Thanks.
I had no clue that *that* is what made them so different from common HID lamps.

My goal is to have a color 628 HID lamp. I happened to find the CPO at a dutch web shop. I'll continue and see if i can find any similar lamps with low CRI but warm white color, but designed for the drivers i already have.
While 90something euro for a brand new Philips driver is a good price, it's just a bit too much for something i am unlikely to put in regular use.

And no, i'm not planning on overdriving it.