Ceramic Metal Halide lamps are a relatively new development to the horticultural market - The technology used is slightly modified from existing HID units. A ceramic, rather than quartz igniter is used as well as a new mix of metallic elements and compounds. The ratio of elements included in the lamp denotes the spectral output. The inclusion of ceramic rather than quartz allows for a much higher operating temperature leading to a more stable and rounded spectral output.
Philips daylight CDM lamps are extremely efficient ceramic metal halide lamps with a spectral output close to natural sunlight. As a result, plants form more lateral branches, have smaller inter-nodal spacing, more flowering sites, and larger root systems, culminating in strong, healthy growth and high-quality yields.
Philips CDM bulbs have an amazing operating life - They maintain their high output for a lifespan of 30,000hrs on average.
Due to their recent entry to the market, ceramic metal halide lamps are known by several different names within the horticultural industry that are all essentially describing the same technology, including:
The Philips 942 Blue lamps output is extremely close to the spectrum of sunlight so its great for veg.
It's an extremely efficient bulb producing 1.7 micromoles (µmol) per Watt
The graph below shows the spectral output of the Philips 942 (Blue) 315w CDM
The Red lamp has a higher output in the red side of the spectrum so it's better for flowering.
The 930 trades some of the varied spectral output for a higher intensity - producing 1.9 micromoles (µmol) per Watt
The graph below shows the spectral output of the Philips 930 (Red) 315w CDM
Which Reflector to use with CDMs
There's an increasing number of options for those wishing to use 315w CMH lamps in their space
How to use:
Philips 315w CDM bulbs can be used as standalone lighting or as supplementary lighting between existing HID units. The CDM's full spectrum will provide colours in the spectrum that are missing in traditional HID fixtures like blues, greens and UV.
Only use these bulbs with a ballast designed for powering 315w CDM units - failure to do so may cause the lamp to explode.
When you first switch on your 315w lighting kit, make sure you leave it on for at least 15 minutes to let the mix of metals inside the lamp properly fuse. Failure to properly ‘bed’ your lamp will result in the warranty being voided and could lead to the lamp failing.
If you’re having trouble installing your lamp into the reflector, make sure that it’s around the correct way as one of the connections is a different shape, preventing the lamp from being installed incorrectly. Sometimes it can be a bit tricky to properly install the bulb - make sure you've pushed the legs of the lamp fully into the holes before turning.
Make sure you use a clean cloth to hold the bulb when installing it into the reflector - any scratches or residues on the bulb may cause it to shatter.
Due to the partial vacuum between the outer and inner glass shealths, glass may fly if the outer envelope is broken. Discontinue use if the bulb is broken, cracked or scratched. If the outer envelope gets blemished, it may stop filtering harmful UVC rays which could have negative effects on long-term health.
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