LED Bar light output readings based off of wattage and distance.

[Wrts1289]

Hello again! So I came across both a graph and chart regarding light output for both wattage and distance. The chart mentions the Kilolux and PAR based off of the wattage of the bulb and distance it is set at. The distances are set at 4", 6", 12", 15" and 18". Both Kilolux and PAR decrease with distance which I assume is from light bar to top of the tortoises shell. From what I understand Kilolux is basically amount of light output and I am not sure about PAR. Any explanations on this chart and how it should be set for a leopard tortoise?

The other question is regarding the graph which below is displayed for reference. This may be looking into it too much and I am not planning on putting live plants into the terrarium.

LIGHT OUTPUTS​

15W​

Distance	Kilolux	PAR
100mm / 4”	34.4	661
150mm / 6”	26.57	448
300mm / 12”	8.9	146
375mm / 15”	6	87
450mm / 18”	4.2	53

22W​

Distance	Kilolux	PAR
100mm / 4”	38.26	660
150mm / 6”	26.54	448
300mm / 12”	10.1	155
375mm / 15”	7.6	108
450mm / 18”	5.58	62

34W​

Distance	Kilolux	PAR
100mm / 4”	41	843
150mm / 6”	35.6	561
300mm / 12”	14.89	226
375mm / 15”	11.4	160
450mm / 18”	8.2	116

51W​

Distance	Kilolux	PAR
100mm / 4”	44.3	859
150mm / 6”	34.3	591
300mm / 12”	15.94	242
375mm / 15”	11.89	187
450mm / 18”	9.56	126

DIAGNOSTIC METERS PUR 68% CRI 85​

Spectra; Everfine (HAAS-1200). Light meter used, Iso-Tech ILM 1335. PAR meter used, Apogee MQ-200. Measurements taken with a power supply at 244.6v 49.9HTZ.

 

[Wrts1289]

This would be based off two 51W bulbs so far.

 

[Tom]

Hello again! So I came across both a graph and chart regarding light output for both wattage and distance. The chart mentions the Kilolux and PAR based off of the wattage of the bulb and distance it is set at. The distances are set at 4", 6", 12", 15" and 18". Both Kilolux and PAR decrease with distance which I assume is from light bar to top of the tortoises shell. From what I understand Kilolux is basically amount of light output and I am not sure about PAR. Any explanations on this chart and how it should be set for a leopard tortoise?

The other question is regarding the graph which below is displayed for reference. This may be looking into it too much and I am not planning on putting live plants into the terrarium.

LIGHT OUTPUTS​

15W​

Distance	Kilolux	PAR
100mm / 4”	34.4	661
150mm / 6”	26.57	448
300mm / 12”	8.9	146
375mm / 15”	6	87
450mm / 18”	4.2	53

22W​

Distance	Kilolux	PAR
100mm / 4”	38.26	660
150mm / 6”	26.54	448
300mm / 12”	10.1	155
375mm / 15”	7.6	108
450mm / 18”	5.58	62

34W​

Distance	Kilolux	PAR
100mm / 4”	41	843
150mm / 6”	35.6	561
300mm / 12”	14.89	226
375mm / 15”	11.4	160
450mm / 18”	8.2	116

51W​

Distance	Kilolux	PAR
100mm / 4”	44.3	859
150mm / 6”	34.3	591
300mm / 12”	15.94	242
375mm / 15”	11.89	187
450mm / 18”	9.56	126

DIAGNOSTIC METERS PUR 68% CRI 85​

Spectra; Everfine (HAAS-1200). Light meter used, Iso-Tech ILM 1335. PAR meter used, Apogee MQ-200. Measurements taken with a power supply at 244.6v 49.9HTZ.

There is no person more qualified to answer this question than @Markw84

I think most of us, myself included, just throw up some lights over head and call it good. I buy whatever incandescent flood I can find for basking, whatever LEDs I can find for ambient light, and then use an Arcadia 12% HO tube for UV and set the correct height with a Solarmeter 6.5. I do look for LEDs in the 5000-6500 K range, but I don't even know what kilolux or PAR is. I've heard of lumens and candlepower measurements, but PAR and kilolux are new terms for me.

 

[jaizei]

Lumens is light output. Lux is the lumens in an area. the further away the light is, the more dispersed the lumens are. Ignoring depreciation over time, the lumens from a light is what it is. Lux is situational.

In the most basic terms, think of PAR like UVI. But for plants photosynthesis instead of for d3.