# ELC vs. EVC lamps - What gives?

#### polterbike

##### Member
Hello, newbie here looking for advice.

I've been putting together a low cost backlighting system for a rock band, no critical lighting involved, just an "ooh pretty lights" kinda thing. Main thrust here is remotely aimable, crisp, bright colors for mood. Using a low output hazer for beam definition.

#### ship

##### Senior Team Emeritus
Benefits of this lamp:
1) Pre-focused alignment of filament to center of the reflector. Very hard to screw up the bench focus with this type of lamp as long as it's fully seated or in it's bracket.

2) The reflector chances are will be both cleaner in not having years of build up on it which even if kept clean does still coat the reflector with time. It would also be more refined by way of not having to have a hole in it's center rear that not only is large enough to fit a lamp in, also has some loss of light extra due to the tolerance and room needed in leaving a gap between lamp and reflector. About 15% of the light from a lamp is lost out of the hole between lamp and reflector.

ELC lamps are for the most part (few exceptions) no matter the brand all 3,400K in color temperature (almost as hot as you can get before the filament burns up) and have a 50 hour lamp life. Output when listed at all normally is within the 800 to 900 Lumen or 800 and 1,500 Lux range dependant upon brand and which catalog the specifications were listed in. Ushio for instance lists both in Lux - the one having a lens seemingly is loosing 700 Lux due to it. You most likely don't need lensed lamps inside a fixture. (Such specifications for all brands change once in a while catalog to catalog for the same brand.)

Beyond this, they have a focus point to the light of about 31.7mm away from the lamp.

Most have a very important note to follow which would also effect the usefulness of the lighting fixture it's installed into:
Burn Base Down to Horizontal. This means the lamp cannot be pointing upwards or up side down. If this note is not followed the lamp's filament will probably stretch out and break due to a lack of support in that direction or more likely the lamp won't cool properly and blow thru it's pinch seal. The only exception for this seems to be the Osram brand of ELC lamp which notes any burning position. Wiko didn't note a burn position but it would probably follow suite with GE, Phillips and Ushio in the above note. With the advent of P-3 pinch seal Technology and other companies following suite with their own improved pinch tech., many of these lamps in the last year or two may have been upgraded to universal burn also. Before you buy a specific brand, check the brand's website to see what the up to date status of the burn position is should this be a concern. Most of the long life ELC lamps have had this upgrade.

ELC lamps are also more cost efficiently available in 300hr, 500hr, 700hr (I remember 800hr from somewhere) and 1,000 hour now.

There is an exchange (short of new technology compensating for it) in lamp design. Mostly, to achieve a longer lamp life you must give up something else or normally a combination of things. Voltage of the lamp could be raised, luminous output could be dropped down and or color temperature can also be dropped. Given the above improvements to pinch seal technology on the other hand, it might be possible that while some things did have to change some, due to the lamp now being able to burn hotter, other things could be adjusted to compensate and keep the output and color temperature the same.

In other words while normally a long life lamp will either be of a higher voltage which adjusts the color temperature and luminous output downward by way of the full voltage not heating the filament up all the way. Or the filament is doped to boost the life in exchange for less color temperature and output.(Doping is a term in reference to the combination of metals making up what the filament is composed of. In doping say in a HPL long life verses high output lamp, different more resistant metals which don't burn as hot but last longer are used and some times a thicker and or larger filament is used.)

In long life lamps available, the real data on the lamp more than at times perhaps wishful thinking is normally not available. Phillips for instance for their ELC/10H lamp in their initial specification of the lamp listed it at 3,100K in color temperature. As of 3/03 they changed it by way of typo or upgrade to 3,400K the same as the 50 hour lamp. The initial listing of the lamp's color temperature for this 1,000 hour lamp seems more realistic. No Luminous output data is available for this lamp. This is the lamp Martin is currently selling their fixtures using that lamp with. I stock them for resale but don't use them. That much life would reduce the output of the fixture. Martin's specifications for their fixtures is based on the ELC lamp and have not been upgraded to cite the expected lower output of the long life lamp.

Note when judging one fixture to another what the lamp this test data was tested with before you put absolute faith into the fixture's output.

Osram in their ELC/7x lamp lists a color temperature of 3,200K which sounds about right and also lists 475 Lumens in output. Seems a bit low and this might be an inaccurate specification.

Possibly the best balance of lamp life to output is the Philips ELC/5H. I have four listings from the catalogs on this lamp since it came out. Half list it as 3,400K and the other half at 3,100K. I have never measured which is accurate but at one point did compare the output of the 5H to a Ushio 3x. The Phillips did seem brighter so lamp life is not an absolute figure for expecting the longer the life, the dimmer the lamp. This is the lamp Martin used to recommend before the 10H came out.

Wiko also sells a ELC/5X. It also lists a 3,400K color temperature. Interesting listing for the lamp, must be a typo given only 50 hours of lamp life listed and a note of 120v operation +/- 76 hours. Given this, I'm not sure what the difference between this lamp, their ELC and their ELC/E is other than the other lamps don't have the note. I expect the 5x lamp is a 500 hour lamp and it's a typo on their part.

Osram, Phillips and Ushio all sell a ELC/3 which would be 300 hours and the same in lamp life as the EVC. Phillips does not list a color temperature for this lamp but does list a 960Lux - roughly 2/3 that of the 50hr version. Osram lists it's color temperature at 3,250K with 550Lux and Ushio at 3,400K which as above was not realistic. Ushio also lists 900 Lumen / 960 Lux for output.

From above it's fairly certain that while there probably is differences in technology and brands, all brands of lamp probably also list a lot of differing information much of it inaccurate. In other words, none of the specifications on the above lamps provides enough accurate information to say what lamp is best.

Finally there is one somewhat new JER 24-250 Phillips lamp out there which might be a ELC, or it might be it's own lamp. Doesn't list it's color temperature but does list 900 Lux for output and 50 hours in life. It's also base down to horizontal.

#### ship

##### Senior Team Emeritus
The EVC lamp has a lot more information provided about it. It’s also heavily dependant upon brand for what’s best or cost effective. Remember that this lamp while it seems much brighter in luminous output is taking for a figure the brightness 360 degrees around the lamp as opposed to the light coming out of a 2" reflector in one direction. Once this lamp is installed into a reflector, the output will also drop. How much depends upon the fixture.

Benefits over that of the ELC, or by Lif code the M-33.
1)Cheaper Lamps
2)Longer specified lamp hours for the high output version of the lamp.

High End buys their QT-8500 lamp as a OEM product from Phillips. Phillips does not sell this lamp to anyone but High End. IT’s not a cheap lamp but is a 300 hour lamp and the one High End specifies for use. This lamp has 3,200K in color temperature and 9,000 Lumens in output.

The Phillips EVC lamp lists 3,200K but only 8,400 Lumens in output as compared to the QT-8500. 300hrs

Ushio lists their EVC lamp at 3,400K in color temperature and 8,400 Lumens in output. 300hrs. This data could make it a very good lamp if one would like one with average output but a higher color temperature.

GE doesn’t seem to be selling this lamp any longer as far as I can tell.
Wiko lists their EVC at 3,200K, 8,400 Lumens but only 200 hours in life.

Osram possibly has the best version of this lamp. It’s listed at 3,200K in color temperature, 9,000 Lumens in output and 300 hours in life. In other words, it’s the same basic lamp as the QT-8500.

There is three alternate long life lamps available on the market should 300 hours not be enough.

Reflekto (owned by Ushio) sells the 250T4.25Q/CL24v. Reflekto is a very good quality company. It does not list color temperature but does list 4,500 Lumens in output and 2,000 hours in life.

EYE ( Iwasaki Lighting International ) has the JC24v250w20H/G2. Been selling it for years as a long life EVC lamp - the customers using it are more concerned about having to change lamps frequently than the loss of output. Color Temperature is 3,000K, Output is 5,750 Lumens, and lamp life is 2,000 hours.

Dura Lamp (a fairly new company on the market) has the JC250 24v GY6.35/CL. I don’t know much about this brand or lamp yet. Color Temperature is 3,000K, Output is 5,700 Lumens and life is an astounding 3,000 hours. If it is all it is said to be, this would be a very cost effective lamp even if 2/3 the output for 10x the life.

There is other options available in installing higher wattage 275 and 300w lamps into the fixture but due to potential heat issues, this would not be recommended without a lot of testing.