Why do CMHs have blue-tinted glass? « on: Today at 04:11:53 AM » Author: SoxFtw
I bought some ceramic metal halides: Philips CDM-T 70W/942 Philips CDM-T 70W/830 Osram HCI-T 70W/942 And all of them have a visibly blue tint on the glass body that is visible even when not powered on. It makes mild difference to the lamp color when warming up and even at full power it's almost glowing. Is there any reason for this or is it part of manufacturing process?
« Last Edit: Today at 04:14:52 AM by SoxFtw »		Logged

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	Re: Why do CMHs have blue-tinted glass? « Reply #1 on: Today at 04:47:05 AM » Author: dor123
The blue glow that you see on the outer jacket of compact MH lamps is the UV dopants that are used to filter the UV radiation, since the outer jacket is made from quartz.
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	Re: Why do CMHs have blue-tinted glass? « Reply #2 on: Today at 05:31:51 AM » Author: SoxFtw
Yes they are G12 single ended lamps, I didn't know the outer jacket wasn't made with UV-blocking borosilicate type glass. Thanks for explaining it.
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