If you’re shaking your head at the moment, I don’t blame you. The above statement is logic which escapes consumers and LED luminaires manufacturers alike… including Empyrean Lighting for a period of time!
Metal Halide High Bay (Traditional High Bay Light)
These lamps are relatively inefficient, use large start-up currents, contains significant amounts of mercury, are difficult to dim or control, have multiple failure points, do not start-up immediately (re-strike time) and have maximum lifespans around 20,000 hours. These facts have made replacement of this technology a prime target for consumers and LED luminaire manufacturers alike.
- Design – LED light sources are uni-directional by nature as opposed to metal halide or other filament style high intensity discharge (HID) luminaires which are omnidirectional. To put a single source, restricted beam angle into a luminaire which further restricts the beam angle (bell reflector) is, frankly, counter intuitive and ultimately does not play to the strengths of the technology. Tight beam angles (LED) + a bell shroud = limited light spread & use.
- Thermal Management - single source high bay luminaries count largely on conduction of heat from the diodes (which are very hot - given they are positioned together as a single source) through large heat sinks. This does not work in a typical warehouse environment, because to get the heat sink to work effectively there must be heat exchange between the surround air and the heat sink material. Often the ambient air temperature in the ceiling of a warehouse can exceed 50⁰C - the heat sink will likely have an equal temperature to this, meaning there will be no exchange at all with the atmosphere, and your LEDs will "cook". Reducing performance, increasing failure rate and shortening life expectance. Our Andromeda luminaries are individually places, and each diode uses both conduction and convection to ensure that the heat is removed efficiently form the diodes even in areas with high ambient temps (one of the reasons we do so much mining work - warehouses in the outback are as hot as you will find on earth). Big, heavy, chunky heat-sinks are not all their cracked up to be in high ambient temperature environments... like most of Australia.
- Single Point
Failure - simply – you have a single point of light intensity with no
Common LED High Bay Solutions
- Restricted driver (ballast/transformer) access – the most common failure on an LED luminaire is the driver. The drivers on these units are buried and difficult to access and replace. Replacement drivers were also not available from the manufacturer who preferred to replace the entire luminaire. Our drivers are rated for the life of the luminaire, however, should one fail they are easily accessible and quick release, meaning a driver change takes less than 120 seconds. Accessibility to drivers (transformers) are key – should they fail quick changes keep maintenance costs low.
- Beam Angle & Variance – this luminaire projects a very tight beam of high intensity light at the workplane. This results in quite a few issues, but two of the biggest are glare and variance. A single high intensity lights source can temporarily blind workers and is more likely to cause glare issues. Also, the higher areas of light intensity on the ground cause variance issues – which means that an even light spread is not achieved - again, potentially causing issues with workers (low visibility, eye fatigue). The Andromeda, due to multiple light sources all individually lensed avoids both issues and provides a very homogenous level of illuminance throughout the facility (this can be seen on DIALux/AGI32 reports). Multi-point LED high bays (such as the Andromeda) provide more homogenous light and less glare than single point sources = “better light”.
- Strength of fitting – the bell reflector on these luminaires is weak – even the slightest impact can dent it which requires replacement as it will affect the light distribution. These fittings are also only rated as IP54 – a significant leak in the ceiling could cause major damage to the luminaire or circuit. The Andromeda fitting is IK08 and IP66 – tough as nails. Further, as the Andromeda is lower profile it is less likely to come to grief with forklifts or equipment working below. Throw a basketball at an LED bell shaped high bay… now throw one at the Andromeda… don’t have a ball, stay tuned to our website and we’ll be doing this for you soon enough!
- Light Projection Surface – the large lens on this luminaire means the possibility of acute build up of dust and other particles which limit light transmission. Unlike a HID luminaire these particles are not burned off – so they can pose a real issue. The Andromeda uses a very small surface area for light transmission which is also electrostatically charged meaning very little dust/dirt can settle on our lenses and light transmission is retained even in the dirtiest, most challenging environments. Less surface area = less cleaning, and IP66 means quick efficient cleaning by power washer or air jet.
- In a recent
project, another supplier had recommended bell shaped LED highbays at 250W and
100lm/W – the Andromedas we specified (after simulating to required lux levels)
were 200W and 110 lm/W. Significant power savings when weighted up over
Andromeda Flood Luminaire
So if you’ve made the tough decision to switch over to LED technology for your facility, please make the easy decision to choose purpose built LED technology to ensure your project is a success.