form109
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ED-Eliptical
BT-Bulged Tubular
ET-Eliptical Tubular
which one out of the three?
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GE M-400A1
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My Pontiac 6000 STE
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My Cars:
1986 Pontiac 6000 STE
1996 Chrysler Concorde LXi
1998 Chrysler Cirrus LXi
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lite_lover
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Darren
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The brighter the better.
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form109
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BT
bt is my favorite,and do they even make an et-25 envelope.
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lite_lover
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Darren
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Yes ET-25 is made,or also called E25, it would be the shape of a 1000W HPS for example.
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The brighter the better.
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RichD
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BT. Any size BT. Nothing says "HID lamp!!" louder to me.
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tmcdllr
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BT-25 & BT-28. I agree, no other bulb shape (BT) screams HID like this one. It's so different and unique.
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Nothing like the beautiful cool white light of a coated Mercury Vapor lamp and the soothing hum of it's magnetic ballast.
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paintballer22
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120V/240V 60hz
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joseph_125
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BT for me too, especially the BT 25 and 28s
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HPS_250
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Long live the HPS and SOX!
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I’m replying nearly a decade later, but my favorite shape is BT-25 or BT-28.
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I’ve always been interested in all kinds of lighting, mainly incandescent and HID, and especially all kinds of sodium lamps (HPS/LPS). I’ll tolerate LED but I’m not a fan of it. I’m not proud to say that my city has Devolved to LED.
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Ash
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Hard to tell, i like all (mostly the E/ED and BT).. But among BT, i like specifically the E-like ones (like that of high power lamps, but also their small versions), not the "squared" ones (like common 100/175W Merc)
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Silverliner
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Rare white reflector
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Administrator of Lighting-Gallery.net. Need help? PM me.
Member of L-G since 2005.
Collector of vintage bulbs, street lights and fluorescent fixtures.
Electrician.
Also a fan of cars, travelling, working out, food, hanging out.
Power company: Southern California Edison.
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wide-lite 1000
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BT , BT-37 to be precise ! 
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Collector,Hoarder,Pack-rat! Clear mercury Rules!!
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