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Difference between revisions of "Philips ML"
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== Manufacturing specificities == | == Manufacturing specificities == | ||
Philips has been releasing lamps for many decades. Lamps produced in the 70s and early 80s are probably not commonly found today. In the 90s and early 2000 Philips was manufacturing lamps in Holland and other countries, while in the last years they were doing the same thing in China. Quality was severely affected as, realistically speaking, there were some occasional lamp defects even in their Holland produced lamps due to average manufacturing quality. It should be noted that mercury vapour lamps were mass manufactured and considered low-cost products, meaning that quality was not paramount. | Philips has been releasing lamps for many decades. Lamps produced in the 70s and early 80s are probably not commonly found today. In the 90s and early 2000 Philips was manufacturing lamps in Holland and other countries, while in the last years they were doing the same thing in China. Quality was severely affected as, realistically speaking, there were some occasional lamp defects even in their Holland produced lamps due to average manufacturing quality. It should be noted that mercury vapour lamps were mass manufactured and considered low-cost products, meaning that quality was not paramount. | ||
Light uniformity on Philips ML lamps was also reduced by the preference for mounting the filament at the opposite end of the lamp base, rather than centrally around the discharge tube. This created a brownish, dirty lower appearance of the lamp, with pronounced yellowing and degradation of internal coating and less useful light directed downwards. The lack of uniformity also translated to lack of colour uniformity as the lamp's output was highly different at the center of the lamp compared with the tip. Overall, the Philips lamps were built very poorly with the only exception of the internal coating that was relatively decent, although far from the best. | |||
Until the manufacturing plants move to China, there were small differences in this product line as the 90s and early 2000s was using the same technology. Chinese built lamps have some slight efficiency improvements that trade off on light quality. The internal coating is thinner and has a different grain size with a potentially different powder mix, improving colour rendering more than what the datasheet suggests. However, the light contribution from the internal filament is reduced, reducing consumption but also slightly increasing the perceived light appearance. The colour temperature seems higher and the light has a slightly greenish appearance, making the lamp much less pleasing than competing Osram HWL lamps. | Until the manufacturing plants move to China, there were small differences in this product line as the 90s and early 2000s was using the same technology. Chinese built lamps have some slight efficiency improvements that trade off on light quality. The internal coating is thinner and has a different grain size with a potentially different powder mix, improving colour rendering more than what the datasheet suggests. However, the light contribution from the internal filament is reduced, reducing consumption but also slightly increasing the perceived light appearance. The colour temperature seems higher and the light has a slightly greenish appearance, making the lamp much less pleasing than competing Osram HWL lamps. | ||