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You are here: Home Volume III October 2004 Product Review: More Spectral Analysis of 250 Watt Double Ended Metal Halide Lamps and Ballasts

Product Review: More Spectral Analysis of 250 Watt Double Ended Metal Halide Lamps and Ballasts

By Sanjay Joshi, Ph.D. Posted Oct 14, 2004 08:00 PM Pomacanthus Publications, Inc.
Since the previous article on 250W Double Ended metal halide lamps and the increase in the availability of more lamps in this category there has been considerable interest in spectral data on these newly introduced lamps.

13 more 250W DE metal halide lamps available within the reef hobby were evaluated along with 2 ballasts used to drive these lamps. The lamps are listed in Table 1. The ballasts used are the "HQI" ballast (ANSI-M80) and the IceCap Electronic Ballast. As usual these lamps were tested using the identical setup to all our previous tests, thus allowing for direct comparison between the lamps.

Table 1: List Of Lamps And Ballasts Tested
250W DE Lamps 250W Ballasts
XDE 10000K PFO-HQI (ANSI -M80)

IceCap (Electronic)

XDE 20000K
CORALVUE 20000K
SUN AQUATICS 20000K
SUN AQUATICS 14000K
SUN AQUATICS 10K
AQUACONNECT 14000K
GIESMAN MEGACHROME 13000K
GIESEMANN 20000K
ARCADIA 14000K
HIT (BLV) 20000K
HELIOS 12500K
HELIOS 20000K

Spectral Output Of The Lamps (Single Ballast)

Since the ANSI-M80 is the recommended ballast for 250W double ended lamps, we decided to compare the lamps using this ballast to establish a baseline of performance.

Figure 1 below shows the spectral output of the nine different lamps when operated by the same ballast - the M-80 ballast. These spectral plots are for the unshielded lamps (i.e. without the use of any UV absorbing glass shield).

figure1-allm80.gif

Figure 1: Spectral plot showing a comparison of the spectrum all the 250W DE lamps tested

Table 2: Comparison of PPFD, CCT, and Power use of the different 250W DE lamps with the M80 ballast - unshielded and shielded
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
XDE 10KK 314 121.6 2.77 136.4 7645 109.5 7026
XDE 20KK 269 121.6 2.59 55.14 na 42.4 na
Coralvue 20KK 314 121.3 2.75 58.19 na 48.35 na
SUN AQ 20KK 333 121.4 2.92 80.28 na 64.13 na
SUN AQ 14K 333 121.8 2.88 77.5 na 61.78 na
SUN AQ 10K 345 121.9 3.25 142 5251 116.5 5053
AQ CON 14KK 313 123.2 2.77 101.6 na 82.1 na
GS MEGA 13KK 336 122.8 2.94 112.9 10418 87.8 8586
GS 20KK 305 122 2.74 52.5 na 43.2 na
ARCADIA 14KK 318 121.8 2.85 88.15 11498 73.39 10577
HIT(BLV) 20KK 306 121.3 2.79 306 55.2 43.9 na
HELIOS 20KK 338 122.5 3.01 77.9 na 62.06 na
HELIOS 12.5KK 371 123.6 3.39 150.1 5533 125.5 5288

Comparison of Lamp Performance Under Different Ballasts

In this section we present the results of testing the different lamps using different ballasts. For each lamp tested different ballasts were used to fire the lamp and data is presented for the unshielded and shielded case. Spectral data is only provided for the shielded case, since we feel that most lamps will be used in this manner.

1) XDE 10000K

Table 3: XDE 10000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 314 121.6 2.77 136.4 7645 109.5 7026
IceCap 253 120.4 2.33 121 7541 95.2 7097
figure2-xde10kk.gif

Figure 2: Spectral Plot of the Shielded XDE 10000K Lamp with the different ballasts

2) XDE 20000K

Table 4: XDE 20000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 269 121.6 2.59 55.14 na 42.4 na
IceCap 224 121.3 2.12 44.6 na 36.1 na
figure3-xde20kk.gif

Figure 3: Spectral Plot of the Shielded XDE 20000K Lamp with the different ballasts

3) CORALVUE 20000K

Table 5: CORALVUE 20000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 314 121.3 2.75 58.19 na 48.35 na
IceCap 254 122.4 2.3 50.7 na 41.1 na
figure4-cvue20kk.gif

Figure 4: Spectral Plot of the Shielded Coralvue 20000K Lamp with the different ballasts

4) SUN AQUATICS 20000K

Table 6: SUN AQUATICS 20000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 333 121.4 2.92 80.28 na 64.13 na
IceCap 252 121.4 2.3 63.8 na 50.8 na
figure5-sun20kk.gif

Figure 5: Spectral Plot of the Shielded SUN AQUATICS 20000K Lamp with the different ballasts

5) SUN AQUATICS 14000K

Table 7: SUN AQUATICS 14000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 333 121.8 2.88 77.5 na 61.78 na
IceCap 256 121.6 2.33 52.9 na 41.5 na
figure6-sun14kk.gif

Figure 6: Spectral Plot of the Shielded SUN AQUATICS 14000K Lamp with the different ballasts

6) SUN AQUATICS 10000K

Table 8: SUN AQUATICS 10000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 345 121.9 3.25 142 5251 116.5 5053
IceCap 209 122 1.9 99.8 5396 82 5208
figure7-sun10kk.gif

Figure 7: Spectral Plot of the Shielded SUN AQUATICS 10000K Lamp with the different ballasts

7) AQUACONNECT 14000K

Table 9: AQUACONNECT 14000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 313 123.2 2.77 101.6 na 82.1 na
IceCap 196 123 1.81 84.8 na 68.6 na
figure8-aqcon14kk.gif

Figure 8: Spectral Plot of the Shielded AQUACONNECT 14000K Lamp with the different ballasts

8) GIESEMANN MEGACHROME 13000K

Table 10: GIESEMANN MEGACHROME 13000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 336 122.8 2.94 112.9 10418 87.8 8586
IceCap 253 122.1 2.28 79.2 10187 63.9 8982
figure9-gs13kk.gif

Figure 9: Spectral Plot of the Shielded GIESEMANN MEGACHROME 13000K Lamp with the different ballasts

9) GIESEMANN 20000K

Table 11: GIESEMANN 20000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 305 122 2.74 52.5 na 43.2 na
IceCap 248 122 2.31 43.64 na 34.3 na
figure10-gs20kk.gif

Figure 10: Spectral Plot of the Shielded GIESEMANN 20000K Lamp with the different ballasts

10) ARCADIA 14000K

Table 12: ARCADIA 14000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 318 121.8 2.85 88.15 11498 73.39 10577
IceCap 248 123.1 2.31 76.3 43253 55.92 19721
figure11-arcadia14kk.gif

Figure 11: Spectral Plot of the Shielded ARCADIA 14000K Lamp with the different ballasts

11) HIT (BLV) 20000K

Table 13: HIT (BLV) 20000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 306 121.3 2.79 306 55.2 43.9 na
IceCap 248 121.3 2.32 41.7 na 33.18 na
figure12-blv20kk.gif

Figure 12: Spectral Plot of the Shielded HIT (BLV) 20000K Lamp with the different ballasts

12) HELIOS 20000K

Table 14: HELIOS 20000K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 338 122.5 3.01 77.9 na 62.06 na
IceCap 250 123.5 2.3 62 na 48.7 na
figure13-helios20kk.gif

Figure 13: Spectral Plot of the Shielded HELIOS 20000K Lamp with the different ballasts

13) HELIOS 12500K

Table 15: HELIOS 12500K
Lamp Power (Watts) Voltage (Volts) Current (Amps) PPFD (Unshielded) CCT (Unshielded) PPFD (Shielded) CCT (Shielded)
M80 371 123.6 3.39 150.1 5533 125.5 5288
IceCap 256 122.8 2.3 101.2 6587 82.25 6872
figure14-helios12kk.gif

Figure 14: Spectral Plot of the Shielded HELIOS 12500K Lamp with the different ballasts

Discussion and Conclusion

Figure 15, and 15 show comparison of power and PPFD of the various lamps tested. Once again as seen from the data and plots, there is wide variation among the lamps and the use of CCT to designate the lamps is pretty much meaningless given that the spectral plots are often very similar yet the lamps are being sold with different color temperatures. The usual disclaimer applies - this data is based on a sample size of one, and we have no idea what the variation is within lamps. The HQI 80 ballasts tends to consume much higher wattage than the rated 250W, while the electronic ballast tends to stay close to the rated power of the lamp. The implications of consuming more power are obvious - more light output, however if this detrimental to lamp life remains to be seen.

Comparing the data here and other 250W DE articles with the data for 250W Mogul lamps, should provide enough factual information to dispel the myth that 250W DE lamps produce more light output than the 250W single ended mogul lamps. A general sweeping statement to this effect cannot be made, and depends on the lamp under consideration.

figure15-ppfdballasts.gif

Figure 15: PPFD (Shielded) - Different ballasts

figure16-ppfdpower.gif

Figure 16: PPFD (shielded) vs Power

Acknowledgements

We would like to thank several people whose help made this study possible. They were kind enough to provide us with lamps and ballasts for testing: Patrick at PFO Lighting, Brian at HelloLights.com, Andy at IceCap Inc, Phil at Giesemann, Edward at Aquaconnect, Venki at Sun Aquatics, TAAM for the Helios lamps, Chris at Hikari Sales, and Moonpod at RC. Finally, we would like to thank Dr. Paul Walker of Penn State University for the use of the spectroradiometer and dark room for testing the lamps.

References

  1. Joshi, S. 1998. Spectral Analysis of Metal Halide Lamps Used in the Reef Aquarium Hobby Part 1: New 400-watt Lamps, Aquarium Frontiers, Nov 1998.
  2. Joshi, S. and Morgan D. 1999. Spectral Analysis of Metal Halide Lamps Used in the Reef Aquarium Hobby Part II: Used 400-watt Lamps, Aquarium Frontiers, Jan 1999.
  3. Joshi, S. and Morgan, D. 1999. Spectral Analysis of Metal Halide Lamps Used in the Reef Aquarium Hobby Part III: New and used 250-watt Lamp, Aquarium Frontiers,
  4. Joshi, S. and Morgan D., 2001. "Spectral Analysis of Metal Halide Lamps - Do Ballasts Make a Difference," 2001 Annual Marine Fish and Reef USA, Fancy Publications. Reprint available here
  5. Joshi, S. 2002, "Spectral Analysis of Recent Metal Halide Lamps: Part IV- 10000K and 12000K lamps," 2002 Annual Marine Fish and Reef USA, Fancy Publications.
  6. Joshi, S. and Marks, Timothy. 2002. Spectral Analysis of Recent Metal Halide Lamps and Ballasts, Advanced Aquarist, Oct 2002,
  7. Joshi, S. and Marks, Timothy. 2002. Spectral Analysis of 150W Double Ended Metal Halide Lamps and Ballasts, Advanced Aquarist, Nov 2002
  8. Joshi, S. and Marks, Timothy, 2004. Spectral Analysis of 400W Lamps: XM, Radiums, Osram, Sunmaster and PFO, Advanced Aquarist, Feb 2004
  9. Joshi, S. and Marks, Timothy, 2004. Spectral Analysis of 250W Double Ended Lamps and Ballasts, Advanced Aquarist, Feb 2004
  10. Joshi S. More Spectral Analysis of 150W DE Metal Halide Lamps, Advanced Aquarist, May 2004.
  11. Joshi S., Spectral Analysis of 250W Mogul Base Lamps-Part I, Advanced Aquarist, July 2004.
  12. Joshi S., Spectral Analysis of 250W Mogul Base Lamps-Part II, Advanced Aquarist, August 2004.
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