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Double ended MH indoor uplighters at a library

Double ended MH indoor uplighters at a library

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One of my favorite relamping accounts, a public library that uses 14 of these 250w metal halide floods, they are about 15' up the wall pointed at the white ceiling to create a very diffused lighting for people reading. Lamps are Plusrite 4000K 250w FC2

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Filename:20190213_192950.jpg
Album name:BlueHalide / New album
Keywords:Lanterns
File Size:493 KB
Date added:Feb 13, 2019
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Date Time:2019:02:13 19:29:50
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BlueHalide
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Feb 13, 2019 at 07:48 PM Author: BlueHalide
Also worth mentioning these compact double ended lamps dont last as long as their E39 ED or BT counterparts, im here probably once every 18 months changing lamps.
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Feb 13, 2019 at 07:49 PM Author: lightinglover8902
Neat! Looks to be a HQI lamp.

sol
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Feb 13, 2019 at 07:55 PM Author: sol
Nice ! It must feel good on the eyes in there. That is something I'd like to try at home, obviously not 14x250W, but nevertheless a good idea.

With these double ended fixtures, if the library were to want change (although it would be more costly), double ended lamps are available in a myriad colour temperatures so a simple relamping would result in a different appearance. I'm sure it would look nice in there with 6500K or even 8000K lighting.
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Feb 13, 2019 at 08:04 PM Author: dor123

Neat! Looks to be a HQI lamp.

This isn't an HQI lamp as it isn't Osram.


Also worth mentioning these compact double ended lamps dont last as long as their E39 ED or BT counterparts, im here probably once every 18 months changing lamps.

Most European compact MH lamps, last well like your E39 MH lamps.

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 European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

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Feb 13, 2019 at 08:07 PM Author: BlueHalide
These fixtures used to use daylight lamps (they were actually Osram HQI-TS 250W/D Pro), but management didnt like the price of $80 per lamp, the 4000K lamps now cost like $22/ea. and have the typical 63 CRI of standard Na-Sc lamps, the Osram daylight lamps had a much better CRI, or at least it appeared so.
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Feb 13, 2019 at 08:35 PM Author: Lumex120
So do these use a special HQI ballast or just a regular pulse start 250w ballast?

Any machine is a smoke machine if you operate it wrong enough.

wide-lite 1000
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Feb 13, 2019 at 08:55 PM Author: wide-lite 1000
very cool fixtures!

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

BlueHalide
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Feb 13, 2019 at 08:59 PM Author: BlueHalide
These all use electronic gear as the fixtures are very lightweight, ballast is mounted in a box just under the reflector. Ive never actually opened the ballast housing on these lights to see what brand/type of electronic ballast is in these, but they run the lamp up to full power in like 15-20 seconds
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Feb 13, 2019 at 09:06 PM Author: sol
I find warmup time depends on lamp and ballast combination. Well, more on the lamp than the ballast. I have a Universal 50W MH in regular use. I have tried older Philips cylindrical arc tube lamps and they warmed up in 1-2 minutes. Then I tried a newer Philips ball arc tube and it warmed up in 30-40 seconds. Now I have a Sylvania Power Ball (Osram ?) and it warms up in 2-4 minutes. I find it is not much different on magnetic gear. Other ballasts may have different characteristics, though.
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Feb 13, 2019 at 10:01 PM Author: BlueHalide
Sol, I agree that warmup is mostly determined by lamp type, however these are just 250w quartz MH with the pinched arctube as you can see in the pic. 20 seconds is the quickest warmup ive ever seen of a higher wattage quartz MH like this from a cold start. Also, electronic HID ballasts seem to run up lamps much faster than magnetic, I imagine this is a design feature, as the ballast manufacturers know people dont want to wait around for lights to warm up.
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Feb 13, 2019 at 10:18 PM Author: Lumex120
I have a VS 70w MH ballast that warms up both a quartz or ceramic lamp in under 30 seconds. It's really nice and there is also no 120hz flicker since it's high frequency. I also have a few 20w MH ballasts of the same brand that are the same way.

Any machine is a smoke machine if you operate it wrong enough.

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Feb 13, 2019 at 10:36 PM Author: lightinglover8902
I wonder if a medium based MH lamp would fit in there. Theres enough space for it.

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Feb 16, 2019 at 08:03 AM Author: Max.
US$80 for an Osram HQI-TS 250W/D? that's quite a steep price! Here in Europe we get these lamps for no more than US$50 (converted), which is still not cheap but at least you get a far better light color (93 Ra8), a longer service life and a better flux maintenance than those cheap Plusrites. Your experience with this customer goes to show what a commodity lamps and lighting systems have become.


Also, electronic HID ballasts seem to run up lamps much faster than magnetic, I imagine this is a design feature, as the ballast manufacturers know people dont want to wait around for lights to warm up.

There is only ONE area in lighting where a fast HID lamp run-up is a ballast design feature: Automotive lighting. This is not even a consideration in all the other (general lighting) applications. The difference that you see in your application is not an intentional one (i.e. its not a design feature), but simply the consequence of differences in I/V characteristics between magnetic and electronic control gears (considering a given HID lamp).
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