| Manufacturer: | Osram | ||||
| Model: | Dulux EL Longlife | ||||
| Application: | General lighting | ||||
| Wattage: | 20W | ||||
| Diameter (max): | 47mm | ||||
| Length: | 145mm | ||||
| Tube Length: | 420mm | ||||
| Bulb/Tube material: | Glass, inner phosphor coating | ||||
| Colour Temperature: | 3000°K | ||||
| Peak output wavelength: | N/A - Broadband emmision. | ||||
| Total light output: | 1'500Lm | ||||
| Rated lifetime: | 15'000 Hours | ||||
| Cap: | B22 | ||||
| Operating voltage: | 230V | ||||
| Operating current: | 180mA (pf = 0.49) | ||||
| Warmup/restrike time: | 1 minute/instant | ||||
| Cost (original): | £5.99 | ||||
| Value (now): | £3.99 | ||||
| Place of manufacture: | Germany | ||||
| Date of manufacture: | Late 2004 | ||||
| Notes: | These lamps have become something of a
staple in the CFL trade I think - they're decent lamps, priced a fair
way above many of the Far Eastern imports, they do seem to be rather
better made though. While I would have still said the 15K hour
lifetime estimate was being a bit optomistic - I ran a lamp on a 24/7
basis (might even have been the one on this page...can't remember!) and
aside for a few power cuts, it ran for just under 22 thousand hours
(Yes...well over two years!). Judging from the discolouration of
one of the tube ends, the eventual failure mode was emitter depletion
of one of the electrodes. While a stable operating enviromnent
like that is the best thing for a fluorescent lamp, so this figure is
probably higher than you'd see in real life - it does demonstrate that
these are pretty long lived lamps. Three other lesser lamps had
been installed and failed in the test area in the time this one was up
there - as such it came really as rather a surprise when it eventually
died! As with many CFLs of this design, the main complaints with it are that it doesn't fit into a good number of conventional light shades, and that it does take a bit of time to warm up, especially if it's really cold. It will still strike quite happily down to -20 degreed centigrade - just expect a dim, purple light for the first few minutes until it warms up. Will be interesting to see what's the equivalent to this particular very normal lamp in a few years time as technology moves on. |
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