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Регистрация: 02.06.2012 Последняя активность: 21.04.2015 12:00 Адрес: Indiana, USA
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ReviewTheLight: Crelant 7G5MT T-Rex
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Don't forget to click "Like" after the page loads! Crelant has long been a leader in producing large high-end lights that excel in long-distance throw. Their popular 7G5 has seen many upgrades over the years (see my review of the 7G5CS U3), and now they've stuck a bigger emitter in it: the Cree MT-G2. The MT-G emitter has long been known for it's extremely high output (at the cost of some efficiency, compared to an XM-L), and now that Cree's upgraded it to the MT-G2, Crelant has found it worthy of inclusion in the 7G5 line as the Crelant 7G5MT T-Rex. Thanks to Crelant and MD Lightsource for providing the 7G5MT for review. I’ll be reviewing the 7G5MT in two sections: first, I’ll discuss the light objectively (the facts about the light itself), then I’ll discuss the light subjectively (my impressions about the light's performance when used for specific applications). If you have any other specific applications you'd like the light tested for, let me know and I'll see what I can do. Video Review Below is a video review of the 7G5MT. Due to my old image hosting site closing down, I've got new restrictions on image uploads and have replaced the "Construction" section of my reviews with a more detailed video review. Coming Soon... This video is available in 1080p HD, but defaults to a lower quality. To select the playback quality click the settings button (looks like a gear) after you've started the video. Objective Manufacturer's Specifications Price: 130 USD Dimensions User Interface Coming Soon... Action Shots You can click on any of these shots to see them full size. Light in Hand BeamSlice MugShot White Wall (Min, Preset Medium, Max) ISO 100, f/3.3, 1/20" Indoor Shots (Min, Preset Medium, Max) ISO 100, f/3.3, 1" Outdoor Shots (Min, Preset Medium, Max) ISO 100, f/3.3, 2.5" Long-Range Shots (Max) ISO 100, f/3.3, 5" Performance Submersion: I submersed the 7G5MT under a foot of water for about an hour, clicking the switch several times. I found no evidence of water entering or damaging the light. Heat: PWM: Drop: I dropped the 7G5MT from about a meter onto various surfaces (including grass, carpet, dirt, and hard wood), and found no cosmetic or functional damage. Reverse Polarity Protection: Over-Discharge Protection: Spectral Analysis All light that we see as white is actually made up of several different colors put together. The relative intensities of the different colors in the mix are what determine the tint of the white we see. For example, cool white LED's have a lot of blue, and warm white LED's have more red or yellow. This measurement was done on a home made spectrometer. The plot below the picture is corrected for the spectral sensitivity of the human eye. Note: the peak in the 900nm region doesn't really exist, it's a piece of the second-order spectrum that's showing up here because of the high intensity of the light source. Output and Runtime ANSI FL-1 runtime ratings are the time it takes for a light to fall to 10% of it's original output (counting from 30 seconds after turning the light on). The vertical axis of the graphs below represents a relative brightness measurement using a home made light box. The horizontal axis is time in hours:minutes:seconds. Runtimes are stated in hours:minutes:seconds. These graphs may be truncated to show detail. Mode Comparison Max Preset Medium I apologize for the gap in the data, my equipment shut down for a time during the test. However, you can imagine the general trend of a line filling in that gap without too much trouble . Throwing Distance ANSI FL-1 standard for stating a light's throwing distance is the distance at which the peak beam intensity (usually at the center of the beam) is 0.25 lux. I calculate throwing distance and candela (lux at 1 meter) by measuring peak beam intensity at five different distances and using the formula lux*distance^2=constant. Peak Beam Intensity: 22,913cd Throw Distance: 303m Note, this is significantly better than spec given by Crelant. Subjective Review Quick break down: + - Long Term Impressions I'll fill this part in after carrying the light for a while. If nothing get's added here, either I find nothing else worth noting about the light, or I end up not using it often. |