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Re: Thomas Alva Edison's trivia page



>i)  Efficiency champs.  Keep in mind that all lumens are not precisely
>created equal, of course, but:
>
>  conventional incandescent:  500PAR64, 6500 (initial) lumens, 500 watts,
>    13 lumens/watt
>  halogen:  50PAR30 (GE Halogen IR), 1000 lumens, 50 watts,
>    20 lumens/watt
>  fluorescent T12, GE Chroma 50, 1870 lumens, 40 watts,
>    46.75 lumens/watt (on a ballast that only draws 40 watts, heigh ho)
>  fluorescent T12, GE rare earth, 2960 lumens, 40 watts,
>    74 lumens/watt (but this depends on the ballast)
>  fluorescent T8, GE rare earth, electronic ballast (!), 2650 lumens, 27 watts,
>    98 lumens/watt
>  fluorescent compact F40/30BX/IS, electronic ballast, 2840 lumens, 30 watts,
>    95 lumens/watt
>  MH, E28 universal burning horizontally, 7100 lumens, 175 watts,
>    41 lumens/watt
>  MH, E28 universal burning VBU, 8300 lumens, 175 watts,
>    47 lumens/watt
>  MH, E28 horizontal [EP39 base], 11300 lumens, 175 watts,
>    65 lumens/watt
>  MH, E37 VBU, 31000 lumens, 400 watts,
>    78 lumens/watt
>  HPS, GE Deluxe Lucalox, 9135 lumens, 150 watts,
>    61 lumens/watt
>  HPS, GE White Lucalox, 4160 lumens, 95 watts,
>    44 lumens/watt

Try 110 lumens/watt for the Iwasaki HPS lamps.The GE DeLuxe and
GE White may be colour improved lamps which are less efficient
I believe.

>  LPS, 19140 lumens, 135 watts,
>    142 lumens/watt

>iii)  Horizontal vs. universal lamps.
>Yes, horizontal lamps have a special base.  VBU oriented lamps do not (but
>the smallest VBU lamp is 400 watts, and it sounds like most people are
>using 175 watt pendants).

Venture makes both horizontal and VBU lamps in 175 watt sizes.
VBU is 67 lumens/watt.

Dave

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