Last viewed - Wow a CLEAR 100w BT25 merc!

File information
Filename:	2011-03-07_13-44-16_819.jpg
Album name:	Silverliner14B / Mercury Vapor Lamps
Keywords:	Lamps
Company and Date Manufactured:	Sylvania, mfd '68
Model Number:	H38-4HT
Wattage:	100w
Lamp Type:	Mercury Vapor
Filesize:	406 KiB
Date added:	Mar 07, 2011
Dimensions:	2592 x 1936 pixels
Displayed:	287 times
Color Space:	sRGB
Contrast:	0
DateTime Original:	2011:03:07 21:44:13
Exposure Bias:	0 EV
Exposure Mode:	0
Exposure Program:	Unknown: 0
Exposure Time:	3/100 sec
FNumber:	f/2.8
Flash:	No Flash
Focal length:	4.97 mm
ISO:	104
Light Source:	D55
Make:	Motorola
Max Aperture:	f/2.8
Model:	DROIDX 7daa00017ff00000015a7d751702002d
URL:	http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=5315
Favorites:	Add to Favorites

Comment 4 to 23 of 23

Page: 1 - 2

joe_347V

[Mar 08, 2011 at 12:15 AM]

Wow! Incredible find, the BT-25s are hard to find by themselves, but a clear Sylvania one, very nice!

mercuryvaporrocks

[Mar 08, 2011 at 12:18 AM]

Wow, you don't see lamps like this too often.

Silverliner14B

[Mar 08, 2011 at 01:14 AM]

Come to think of it, I was born in the 70s and while I certainly remember BT25 mercs and HPS lamps from way back even a few cleartops, I don't even recall seeing a single clear 100w mercury BT25 in use!

TiCoune66

[Mar 08, 2011 at 01:19 AM]

Yet the clear mercury lamps of other wattages are way more common, I wonder why!

GullWhiz

[Mar 08, 2011 at 02:25 AM]

I actually won a bunch of clear 100 watt MV BTs but because of the clumsy seller I didn't get any!!! Was gonna give you one Dave! Lucky!

RCM

[Mar 08, 2011 at 04:24 AM]

Nice lamp! for sure this one is RARE! protect it well Dave!

Sailormoon_01_uk

[Mar 08, 2011 at 08:08 AM]

Was this the one on E-bay, I was going to buy one but the shipping costd from the USA tothe UK was too high.

All the Best

Colin

lite_lover

[Mar 08, 2011 at 10:29 AM]

Nice lamp!!

gailgrove

[Mar 08, 2011 at 12:48 PM]

Nice lamp

gmercury2000

[Mar 08, 2011 at 01:00 PM]

Very nice lamp Dave, I bought one as well! Most likley from the same seller

Silverliner14B

[Mar 08, 2011 at 02:11 PM]

Thanks all for the comments! I have some classic Hi-Output White /W mercury lamps that should be on the doorstep anytime this week. GE, Sylvania, Radiant, and even a Norelco.

GullWhiz

[Mar 08, 2011 at 04:38 PM]

MINE?!

Silverliner14B

[Nov 02, 2011 at 02:14 AM]

Update! I am now the owner of not one but two BT-25 clear mercs, it is a Sylvania just like this but is slightly used and it came from a different seller.

joe_347V

[Nov 02, 2011 at 02:15 AM]

Nice! I have a BT 25 Sylvania from the same seller you got your first one from.

streetlight98

[Nov 24, 2011 at 04:02 PM]

Very nice lamp! Very Happy

Why did the older mercs have blackened ends when new? Neutral

Silverliner14B

[Nov 24, 2011 at 05:29 PM]

They don't normally have end blackening when new, they should not either. Sometimes there may be a little silverly deposit at the ends.

joe_347V

[Nov 24, 2011 at 05:45 PM]

I've noticed that my older MV lamps have a lot of lines on the arc tube too.

TiCoune66

[Nov 28, 2011 at 10:55 PM]

Wouldn't that silver coating be thermal insulation to keep the electrodes hot enough in lower wattage lamps?

Silverliner14B

[Nov 29, 2011 at 12:53 AM]

Yep the end coating is typical in low wattage MV lamps. Ever notice the Philips 100w mercs have gold paint?

joe_347V

[Nov 29, 2011 at 01:13 AM]

I did, and I thought it was pretty interesting.

Comment 4 to 23 of 23

Page: 1 - 2

Gallery of Lights

Wow a CLEAR 100w BT25 merc!

I finally got to own one of these rare birds after several failed attempts to get one! This bulb is going to be well protected! Its a vintage Sylvania 100w H38-4HT lamp from around '68. NOS and all.