Replacement metal halide bulbs

Joined
12 Nov 2008
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374
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Kendal, Cumbria
I've got an Arcadia Series 4 pendant luminaire and I'm struggling to find a replacement metal halide lamp for it. The current one is working, but I'd like to have a spare to hand. Any suggestions?
Specification : Metal halide 150w - 5200k double ended rx7s
Geisemann in Germany do a suitable lamp (at 4200k) but (post Brexit) shipping is unclear from their website - any UK stockists out there?
 

nnnal

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11 Apr 2016
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Slave Lake, Canada
When i was using metal halide i had great results growing plants with this: Osram Powerstar Excellence HQI-TS 150W D RX7S-24. It is rated at 5450k but there is a 4200k version as well, and they are easy to find.

Sent from my SM-N900W8 using Tapatalk
 

jolt100

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13 Jan 2008
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bury,lancs
I have just replaced the MH units in my Geissmann infinity with led floodlights and still have the 2 150w bulbs if you would like them as spares? They were both working when I took them out. Lamp says "coral" but they look white, I liked the colour but not the heat.
Cheers
John
 

Oldguy

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27 Aug 2018
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Gloucestershire, UK
replacement metal halide lamp
With a bit of luck an internet search should get you a bulb to fit. Look at wattage and type of bulb, then temperature. These and mercury lamps were never specifically designed for aquariums but are 'off the shelf' commercial bulbs and control units re-packaged for niche markets., think of UVC and Glowlux bulbs/tubes.

Always fancied metal halides for excellent colour rendering and efficiency, but cost was always a factor.

God luck with your search.
 

paul.in.kendal

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12 Nov 2008
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Kendal, Cumbria
Follow-up question if I may:
End fittings showing up in my search for that Osram lamp vary. There's this one, which looks like what I've currently got:
20210110_124228.jpg

but most look like this :
20210110_124246.jpg


Are they interchangeable?
 

paul.in.kendal

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12 Nov 2008
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Kendal, Cumbria
New lamp installed. This is what the old one looked like - tricky to remove, as the ceramic end caps crumbled.
20210113_142316.jpg

And the full reference - I've checked, this is the 5200k version.
Thanks again for all the help, people.
20210113_143420.jpg
 

Sweded

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1 Jan 2016
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Location
Stockholm
You should take a picture of how the tank looks with that bulb and compare it with your old bulb.

There is an 8k bulb I really like the appearance of.
 
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