Philips CDM-Tm security risks « on: March 17, 2025, 11:12:52 PM » Author: bulb_tester2009
Last night I received my Philips CDM-PV 20W electronic ballast and started the Philips MASTERColour CDM-Tm 20W/830,which I bought on a second-hand platform before and it looks like it is heavily used.   At start-up, the bulb ignites quickly and soon enters the green color of the mercury discharge.   After another half minutes, the bulb entered a bright warm white.   However, after 10 seconds, the color of the bulb getting red slowly and turns off automatically.   At first, I thought it was a bulb that was about to be damaged and went out naturally, but when I was about to turn off the power, an accident happened.   The arctube of the bulb suddenly exploded without warning, and the fragments of the explosion instantly crashed the glass cover and created a large amount of fragments.   Some of the high-temperature debris and halides stucked on my desk and burned a few small black spots.   The entire glass cover was full of halide splattered from the explosion of the arctube.   So I immediately turn off the power, opened the window and turn on the ventilation fan, and used paper to remove all the debris.   During the cleanup, I noticed that some debris had been ejected half a meter away.   I'm glad it didn't splash my eyes because I'm not nearsighted, and I didn't have goggles in my dormitory.  This made me doubt the safety of this product.  Although I spent more money on two new samples, I didn't dare to use them.  Because I'm not sure if it's a problem with the ballast or the bulb.
« Last Edit: March 17, 2025, 11:18:05 PM by bulb_tester2009 »		Logged

My interest in lights began when I was a child
One of the few Chinese users in LG

Lamp bases in China:E12(CES) E14(SES) B22d(BC) E27(ES) E40(GES)
The use of resistor-capacitor drivers or very poor quality LEDs in my collection is prohibited.

	Re: Philips CDM-Tm security risks « Reply #3 on: March 20, 2025, 06:13:27 AM » Author: bulb_tester2009
Quote from: RRK on March 18, 2025, 03:54:47 PM Lower wattages of MH lamps run at especially high pressure, so are surprisingly more prone to violent explosions than larger ones. I was more lucky, playing with some seriously beaten up 70W Philips CMH's, so far nothing bad happened. One died silently, probably finally developing through arctube corrosion. Generally, CMH lamps rarely explode. For new ones the risk seems to be close to zero. I have bought 2 new lamps and they can work properly. It seems that that second-hand lamp is indeed close to EOL.
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My interest in lights began when I was a child
One of the few Chinese users in LG

Lamp bases in China:E12(CES) E14(SES) B22d(BC) E27(ES) E40(GES)
The use of resistor-capacitor drivers or very poor quality LEDs in my collection is prohibited.

	Re: Philips CDM-Tm security risks « Reply #4 on: March 20, 2025, 06:14:56 AM » Author: bulb_tester2009
Quote from: sol on March 18, 2025, 08:26:56 AM I’m glad it wasn’t more serious. You now have first hand experience as to why enclosed rated (non protected) lamps should never be operated in open fixtures. If you get a new lamp and use it in an enclosed fixture, you should be good to go. Unfortunately, I don't have enough space to place fixtures in my home, and some fixtures seems difficult to buy.
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My interest in lights began when I was a child
One of the few Chinese users in LG

Lamp bases in China:E12(CES) E14(SES) B22d(BC) E27(ES) E40(GES)
The use of resistor-capacitor drivers or very poor quality LEDs in my collection is prohibited.

	Re: Philips CDM-Tm security risks « Reply #5 on: March 20, 2025, 06:17:22 AM » Author: dor123
@RRK: I've noticed that my 70W R7s MH lamps, don't reaches greenish color of mercury during run-up, when only the mercury being ionized. This in contrast to 400W MH lamps, that reach greenish color during the mercury phase. Is this related to the higher mercury pressure of the lower wattage MH lamps compared to the higher wattage ones?
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Philips CDM-Tm security risks « Reply #8 on: March 20, 2025, 10:37:39 PM » Author: dor123
@RRK: Only my Osram HCI-TS 70W/830, getting green when the thallium vaporizing. My Osram HQI-TS 70W/WDL Excellence and my Philips MHN-TD 70W both /730 and /740, don't reaching green when the thallium vaporizing.
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I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the international date format (dd.mm.yyyy).

I lives in Israel, which is a 220-240V, 50hz country.

	Re: Philips CDM-Tm security risks « Reply #10 on: March 24, 2025, 10:50:08 PM » Author: bulb_tester2009
Quote from: sol on March 20, 2025, 04:27:28 PM You don't absolutely need a proper MH fixture. You can use a heavy duty vapour tight incandescent fixture. You'll have to remove the existing lamp holder and put the proper one in (I believe yours is PGJ5). I've been running several 20 and 35 watt CMH lamps in vapour tight fixtures for years now with no issues. I bought the GU6.5 version. Fortunately, after my constant search, I finally found a matching lamp holder. Now I can start assembling the fixture!
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My interest in lights began when I was a child
One of the few Chinese users in LG

Lamp bases in China:E12(CES) E14(SES) B22d(BC) E27(ES) E40(GES)
The use of resistor-capacitor drivers or very poor quality LEDs in my collection is prohibited.

	Re: Philips CDM-Tm security risks « Reply #11 on: March 24, 2025, 10:59:07 PM » Author: bulb_tester2009
Quote from: Laurens on March 21, 2025, 02:38:34 AM The datasheets tell you all you need to know - they explicitely state for many MH lamps that they are required to be used in fixtures that can contain the fragments of an exploding lamp. There are lamps available with a strong enough outer balloon to contain any shrapnel from an exploding arc tube, but those are not very common - usually those are the MV retrofit ones. There are incandescents too that can burst, the big PAR stage lights could shower the stage in boiling hot, very heavy and sharp glass chunks. That's why those are often seen with a piece of steel mesh/chicken wire over the front. Shields and nets do guarantee safety. I will use acrylic or glass shells to build a rectangular container to protect them, so that the light bulbs can be lit with both view and safety.
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My interest in lights began when I was a child
One of the few Chinese users in LG

Lamp bases in China:E12(CES) E14(SES) B22d(BC) E27(ES) E40(GES)
The use of resistor-capacitor drivers or very poor quality LEDs in my collection is prohibited.