about Chinese version F21T5 current « on: March 01, 2022, 08:29:10 AM » Author: bulb_tester2009
Guys, I need to know the current of the single lamp tube of the F21T5 lamp tube, which means whether my magnetic ballast test can be carried out normally.
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	Re: about Chinese version F21T5 current « Reply #1 on: March 01, 2022, 08:42:54 AM » Author: dor123
The 21W T5 lamp can only be operated on an electronic ballast. It have too high lamp voltage to be operated on a series choke.
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	Re: about Chinese version F21T5 current « Reply #2 on: March 01, 2022, 01:28:04 PM » Author: Medved
It is rated for 165mA, but that means arc voltage of 141V. Too much for just a series choke on 230V mains. Maybe some lead style ballast (a "7..11W PL-S" ballast in series with 1.35uF/450VAC "motor run" capacitor) may be able to run it with a manual preheat circuit, but better to doublecheck the final operating current and adjust the capacitor value accordingly (by using another value or by assembling it by parallel connection of multiple caps). Normally just a series choke is limited to arcs of no more than about 50% of the mains voltage, so 110V in your case.The series LC is able to provide an elevated voltage for zero cross reignition, so the arc uses to be a bit more stable, so the allowance for a bit higher arc voltage, so there is a chance the 140V lamp may work. But nothing is guaranteed in this area. You may start to face problems with lamp lifetinme and reliability as well: The 50Hz may be too slow for electrodes optimized for high frequency, so their surface temperature may fluctuate too much (so at some point suffer from insufficient emission, in another from too fast material evaporation due to too high temperature)
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	Re: about Chinese version F21T5 current « Reply #3 on: March 03, 2022, 06:45:42 AM » Author: bulb_tester2009
Quote from: dor123 on March 01, 2022, 08:42:54 AM The 21W T5 lamp can only be operated on an electronic ballast. It have too high lamp voltage to be operated on a series choke. Yes, it may be due to the voltage, because my magnetic ballast is aluminum core and 210-230V, but my ballast supports 220V50Hz.
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I've been collecting light bulbs since I was 2 years old and I've been collecting them ever since.
 
One of the few Chinese users here
Note:
Bulb base in China:E12(CES) E14(SES) B22d(BC) E27(ES) E40(GES)

	Re: about Chinese version F21T5 current « Reply #4 on: March 05, 2022, 08:56:55 AM » Author: WorldwideHIDCollectorUSA
For the F21T5 HE tubes to ignite on 220v-240v mains with a simple series choke ballast, you might be able to use some European 70w-125w fluorescent tube starters as such starters are designed to ignite fluorescent tubes with an arc voltage drop much higher than most up to about 180v at the maximum. You would likely need a series capacitor to get the tube going if its arc voltage drop is between 150v and 180v.
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DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: about Chinese version F21T5 current « Reply #5 on: March 05, 2022, 03:48:48 PM » Author: Medved
The European "70..125W" starters are not for higher voltate, but have just beefier contacts. The lamp arc voltage of these lsmps is about the same 100'-ish V as e.g. the 40 (36) or 65 (54)W The thing is, the starters have to have their trigger voltage between the lamp arc vs the mains voltage. And because the spread of the actual trigger voltage is quite wide, it also requires the "factor of 2" gap. With a 140V lamp with rather high overshoots, there won't be much room for a glowbottle starter to fit voltage wise.
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	Re: about Chinese version F21T5 current « Reply #6 on: March 05, 2022, 04:18:23 PM » Author: WorldwideHIDCollectorUSA
I have known that British 5 foot F50T8 fluorescent tubes are known to use dedicated glowbottle starters despite having an arc voltage drop of 180v. From what I am aware of, the 6 foot F70T8, F75T12, the 8 foot F100T12, and 8 foot F125T12 tubes have an arc voltage drop of at least 130v and will not start with regular 4-65w starters. As a result, those fluorescent tubes require special 70w-125w starters. Medved, are you essentially saying that fluorescent tubes with an arc voltage drop of 130v and higher will flicker endlessly on European 70w-125w starters?
« Last Edit: March 05, 2022, 04:29:52 PM by WorldwideHIDCollectorUSA »		Logged

Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.

DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.

	Re: about Chinese version F21T5 current « Reply #7 on: March 06, 2022, 08:55:24 AM » Author: Medved
130V on a high current lamp isn't by far that bad as 120V on a low current one. What matters is the lamp voltage including zero cross overshoots (which use to get higher at low currents). And we are talking here about a 140V lamp, so even higher overshoots. Arc voltage drop of 180V may work with a glowbottle starter, but rather on 400V. There is enough voltage room to fit the starter...
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