Difference between revisions of "Philips MHN-TD"

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Philips MHN-TD (view source)

Revision as of 11:18, 30 September 2021

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Metal Hallide lamps are still widely used on commercial, industrial and architectural lighting but in these applications LED lamps are quickly replacing them due to much better performance, lower energy consumption and easy servicing. Light appearance is coll white or daylight, depending on lamp model, with good colour reproduction and low ultraviolet emission. The lamp can be used indoors as well as outdoors, when intense lighting is required as most surrounding look quite pleasing being light with new lamps.
Metal Hallide lamps are still widely used on commercial, industrial and architectural lighting but in these applications LED lamps are quickly replacing them due to much better performance, lower energy consumption and easy servicing. Light appearance is coll white or daylight, depending on lamp model, with good colour reproduction and low ultraviolet emission. The lamp can be used indoors as well as outdoors, when intense lighting is required as most surrounding look quite pleasing being light with new lamps.


Exterior lighting is a good application as most gardens and outside areas are well showcased. The lamp themselves do release some heat meaning that closed fixtures are not well suited if not specifically built for this purpose. Care should be taken when using these metal-hallide lamps as they are sensitive to the operating position especially when inside enclosed fixtures. Improper heating of lamp can destroy it prematurely and present a safety hazard so special precaution should be exercised. While lamp warm up time is low, with the lamp achieving high output quite quickly, they are slow to restart, 10 minutes pauses not being uncommon.
These type of double-ended lamps were used sometimes for lighting exterior areas, especially for higher powered lamps but the most frequent application was indoor accent lighting with lower wattages. The lamp was relatively affordable (for a metal hallide lamp) and compact, having a successful niche until LED lamps appeared. Since they are very compact light sources it should be noted that heat output is very high, making the lamp unsuitable for open-air operation, seriously limiting flexibility. Another very important limitation is caused by the mandatory operating position and relatively short lamp life. While lamp warm up time is low, with the lamp achieving high output quite quickly, they are slow to restart, 10 minutes pauses not being uncommon. Both high pressure mercury vapour as well as sodium vapour ballasts can be used if provided with a suitable ignitor.  


While both high pressure mercury vapour and high pressure sodium gear and fixtures can be used, the lamp works closer to designed parameters when used with inductive ballasts for mercury vapour lamps and a suitable ignitor added on the circuit as required. Compact, boxy symmetric and asymmetric fixtures were popularly. Clear lamps are well suited to high efficiency reflector fixtures while coated lamps work better in open luminaries or classic mercury vapour fixtures.  
Overall, MHN-TD lamps are not great for retro purposes as the lamp is quite cumbersome to use and does not have any special features to showcase. Fixtures must be designed to house this type of lamp, meaning that a lone lamp is not a good choice and a complete system must be found. Limitations on operating positions and poor colour and lumen maintenance mean that spare lamps should be considered if long-term use is required.
 
With adequate care and good ventilation, HPI metal hallides can be used vertically, in a freestanding position as mercury vapour lamps but lifetime will be reduced. HPI-T lamps are much more sensitive to operating position. Lamps age differently and this means that a series of lamps may exhibit different colour intensity and light intensity depending on wear and group replacement should be considered to maintain uniformity. Just as well, lamps should be replaced as soon as light and colour uniformity is affected, as old lamps present a higher risk of catastrophic failure.
 
While products that have an internal ignitor are easier to operate, they are quite rare. Also, these lamps may be less reliable than standard ones that do not include internal ignitors since the ones being supplied are built to a lower quality standard and made to a set cost and space constraint.


== Understanding manufacturer data ==  
== Understanding manufacturer data ==  
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