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Spectral Analysis of XM 15000K Metal Halide Lamps by Sanjay Joshi | Jun 15, 2005 |
S ince their introduction in the last few months, the XM 15000K metal halide lamps have generated a lot of interest. This article presents a complete analysis of these lamps. The lamps and ballasts used for the evaluation are presented in Table 1 below. As usual these lamps were tested using the identical setup to all my previous tests [1], thus allowing for direct comparison between the lamps.
Table 1: List of XM 15000K lamps and ballast tests reported in this article
Lamps Ballasts XM 400W 15000K (Mogul base) PFO-HQI Taiwan – HQI Standard Magnetic (M59) IceCap (Electronic) Blueline (Electronic) Reef Fanatic (Electronic) EVC (Electronic) Coralvue (Electronic) XM 250W 15000K (Mogul base) FO-HQI (ANSI -M80) Standard Magnetic (M58) IceCap (Electronic) Blueline (Electronic) Reef Fanatic (Electronic) EVC (Electronic) XM 250W 15000K (Double Ended) PFO-HQI (ANSI -M80) IceCap (Electronic) Blueline (Electronic) Reef Fanatic (Electronic) EVC (Electronic) XM 175W 15000K (Mogul Base) Standard Magnetic (M57) Lumen General (Electronic) XM 150W 15000K (Double Ended) HQI Icecap (Electronic)
XM 400W 15000K Table 2: XM 400W 15000K performance on all ballasts
Figure 1: Spectral data for XM 400W 15000K Lamps on all ballasts
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt Magnetic -M59 452 123.2 4.0 104.7 0 0.2316 PFO-HQI 512 121.3 5.55 114.8 0 0.2242 Blueline 383 122.2 3.27 75.4 0 0.1969 Reef Fanatic 428 122.5 3.64 83.9 0 0.1960 EVC 418 121.4 3.59 85.4 0 0.2043 Icecap 416 122.9 3.5 82.2 0 0.1976 Taiwan – HQI 457 122.2 4.01 106 0 0.2319 Coralvue 453 121.2 3.87 103.8 0 0.2291
XM 250W 15000K Mogul Base Table 3: XM 250W 15000K Mogul Base performance on all ballasts
Figure 2: Spectral data for XM 250W 15000K Mogul Base Lamps on all ballasts
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt Magnetic (M58) 295 122.8 2.82 55.7 0 0.1888 PFO-HQI (M80) 352 124 3.18 80.2 0 0.2278 Blueline 253 122.6 2.17 41.9 0 0.1656 Reef Fanatic 256 123.1 2.2 53.2 0 0.2078 EVC 272 122.4 2.33 50.6 0 0.1860 Icecap 255 123.2 2.29 47.6 0 0.1867
XM 250W 15000K Double Ended Lamps Table 4: XM 250W 15000K Double Ended Lamps performance on all ballasts (unshielded)
Figure 3: Spectral data for XM 250W 15000K Double Ended Lamps on all ballasts (Unshielded)
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt PFO-HQI 288 122.7 2.72 56.3 15714 0.1955 Reef Fanatic 255 123.6 2.18 61.6 39197 0.2416 Blueline 250 120.8 2.19 55.4 16126 0.2216 Icecap 242 122.8 2.28 53.3 21981 0.2202 EVC 272 122.0 2.33 66.8 16404 0.2456
Table 5: XM 250W 15000K Double Ended Lamps Performance on all ballasts (Shielded)
Figure 4: Spectral data for XM 250W 15000K Double Ended Lamps on all ballasts (Shielded)
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt PFO-HQI 288 122.7 2.72 45.5 12898 0.1580 Reef Fanatic 255 123.6 2.18 49.6 22625 0.1945 Blueline 250 120.8 2.19 45.4 13115 0.1816 Icecap 242 122.8 2.28 43.5 16099 0.1798 EVC 272 122.0 2.33 54.9 12854 0.2018
XM 175W 15000K Mogul base Table 6: XM 175W 15000K Mogul base performance on all ballasts
Figure 5: Spectral data for XM 175W 15000K Mogul base Lamps on all ballasts
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt M57 198 124.4 2.06 39 0 0.1970 Lumen General 181 124.4 1.63 35.8 0 0.1978
XM 150W 15000K Double Ended Table 7: XM 150W 15000K Double Ended performance on all ballasts (Unshielded)
Figure 6: Spectral data for XM 150W 15000K Double Ended Lamps on all ballasts (UnShielded)
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt Icecap 172 123.2 1.46 33.5 14182 0.1948 HQI 181 123.2 1.62 30.9 11004 0.1707
Table 8: XM 150W 15000K Double Ended performance on all ballasts (Shielded)
Figure 7: Spectral data for XM 150W 15000K Double Ended Lamps on all ballasts (Shielded)
Ballast Power Watts Input Volts Input Amps PPFD CCT Efficiency PPFD/Watt Icecap 172 123.2 1.46 26.5 14300 0.1541 HQI 181 123.2 1.62 25.18 13094 0.1391
Discussion and Summary A question of interest for most hobbyists is – How do this lamps compare to the XM 20000K lamps.? Table 9 shows a comparison of the PPFD values for the XM 15000K lamps and the XM 20000K lamps. What is interesting to note is that several of the lamps – the 250W mogul ended, 250W DE, and 150W DE lamps had in fact correlated color temperatures around 15000K. For the other lamps the Licor software used with the spectroradiometer was unable to compute the correlated color temperature. Spectral plots of all these lamps on “HQI” ballasts (except 175 which is on magnetic ballast) are shown in figure 8. They all have very similar spectral shape, yet the color temperature was not computable in all cases (More on Color Temperature in a future article).
Figure 8: Spectral plots of all XM 15000K lamps on “HQI” ballasts
Table 9: Comparison of PPFD with XM 20000K lamps
Lamp Ballast PPFD XM 15K PPFD XM 20K 400W Mogul Magnetic -M59 104.7 128 PFO-HQI 114.8 98 Blueline 75.4 91 Reef Fanatic 83.9 96 EVC 85.4 94 Icecap 82.2 99 Taiwan – HQI 106 114 Coralvue 103.8 na 250W Mogul Magnetic (M58) 55.7 73 PFO-HQI (M80) 80.2 79 Blueline 41.9 na Reef Fanatic 53.2 61 EVC 50.6 na Icecap 47.6 53 250W DE (unshielded) PFO-HQI 56.3 55 Reef Fanatic 61.6 na Blueline 55.4 na Icecap 53.3 44 EVC 66.8 na 150W DE (unshielded) Icecap 33.5 32 HQI 30.9 28 175W Mogul Magnetic (M57) 39 na Lumen General 35.8 na
Figure 9: Spectral comparison of a XM 400W 15000K lamp with a XM 20000K lamp
na – data not available
A comparison with the spectral plot of a XM 20000K lamp is shown in figure 9. As seen from the figure, the XM 15000K when compared to a XM 20000K on the same ballast does have less output in the blue region at 454nm and 420nm, and has higher output from 460 nm -700nm (except for around 550 nm). This would tend to indicate that this lamp would appear less blue than a XM 400W 20000K lamp and hence a rating of 15000K.
Comparison of the 250W Mogul XM 15000K with its 20000K counterpart reveals very similar results to that of the 400W lamp, as seen in figure 10, and similarly for the 250W DE lamps as seen in figure 11.
Acknowledgements I 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: Jason Ghee from Hellolights.com for supplying the lamps used in this study, Patrick at PFO Lighting, Andy at IceCap Inc, Perry at Sunlight Supply, Vince at Ocean Encounters, Champion Lighting, and Reef Fanatics for the ballasts. Finally, I would like to thank Dr. Paul Walker of Penn State University for the use of the spectroradiometer.
Figure 10: Spectral comparison of a XM 250W 15000K lamp with a XM 20000K lamp
References www.reeflightinginfo.arvixe.com
Figure 11: Spectral comparison of a XM 250W DE 15000K lamp with a XM 20000K lamp
Sanjay Joshi in real life is a Professor of Industrial and Manufacturing Engineering at Penn State University. He has been a reef addict since 1992, and currently keeps several reef aquariums at home including a 500G SPS coral dominated reef. He also co-manages the 500G aquarium at Penn State. He has published several articles in magazines such as Marine Fish and Reef Annual, Aquarium Frontiers, Aquarium Fish, and Advanced Aquarist. In addition, he has been an invited speaker at several marine aquarium society meetings in the US and Europe. He received the MASNA award in 2006, for his contributions to the marine aquarium hobby.
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