IESNA:LM-63-2002 [TEST] Umbel light 4W - rotationally symmetric [TESTLAB] Hudson Lighting Lab [TESTDATE] 11-SEP-2026 [ISSUEDATE] 30-SEP-2026 [MANUFAC] Hudson Lighting Ltd [LUMCAT] Umbel [LUMINAIRE] Umbel light 4W [OTHER] POST-PROCESSED - NOT A RAW MEASUREMENT. [OTHER] Rotationally symmetric distribution derived from the HP880D raw [OTHER] scan by taking the MEDIAN across the 12 measured C planes at each [OTHER] gamma (median rejects the single-plane notch at C0 and the low [OTHER] nadir reading on the C60/C240 scan), then rescaling to preserve [OTHER] the measured total flux of 214.50 lm. [OTHER] Valid only if the luminaire is rotationally symmetric in service. [OTHER] The as-measured scan shows a 4-fold azimuthal variation reaching [OTHER] 3:1 at gamma 60-80 which this file treats as measurement artefact. [OTHER] Gamma 0 = nadir. Absolute photometry, 4.0 W. TILT=NONE 1 -1 1 181 1 1 2 0 0 0 1 1 4.0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 0.0 136.2 136.3 136.5 136.4 136.1 136.1 136.2 136 135.9 135.3 135 134 132.7 130.6 128.1 125.3 122.2 119 115.6 112 107.9 103.2 99.99 99.35 98.47 95.95 93.97 91.97 88.43 85.84 83.08 80.14 77.36 72.63 69.39 66.35 63.56 61.01 58.8 56.85 54.74 54.24 53.26 50.57 48.15 45.88 43.68 41.6 39.62 37.68 35.79 33.87 32.01 30.21 28.42 26.63 24.95 23.23 21.65 20.21 18.84 17.55 16.32 15.11 13.96 12.9 11.9 10.9 9.968 9.067 8.238 7.481 6.776 6.126 5.527 4.922 4.329 3.8 3.33 2.981 2.671 2.242 1.857 1.522 1.245 0.9968 0.7798 0.5995 0.4599 0.3752 0.3169 0.2635 0.2361 0.2238 0.2194 0.2175 0.216 0.215 0.2136 0.2116 0.2087 0.2052 0.2008 0.1974 0.1935 0.1896 0.1896 0.1905 0.1925 0.194 0.194 0.1979 0.2033 0.2092 0.216 0.2234 0.2317 0.239 0.2483 0.2576 0.267 0.2772 0.2885 0.2993 0.3115 0.3238 0.3365 0.3492 0.363 0.3732 0.3826 0.3938 0.4046 0.4139 0.4247 0.435 0.4487 0.4629 0.4761 0.4888 0.5011 0.5124 0.5222 0.5315 0.5403 0.5481 0.5569 0.5648 0.5721 0.5795 0.5839 0.5883 0.5912 0.5937 0.5966 0.6005 0.602 0.6015 0.602 0.6 0.5981 0.5956 0.5956 0.5971 0.5971 0.5942 0.5922 0.5893 0.5888 0.5893 0.5902 0.5917 0.5937 0.5961 0.6 0.604 0.6049 0.6044 0.6015 0.5961 0.5937