Keldan Lights Video 4x Blue - Blue Light (450nm), 20 watts radiated

20 watt ra­di­at­ed pow­er at 450 nm wave­length
14-55 watt LED pow­er
Burn­time 50-200 min­utes
SKU: kel-700
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Keldan Lights



LED tech­nol­o­gy for high­ly ef­fi­cient BLUE light ra­di­a­tion for flu­o­res­cence photg­ra­phy

Our pro­pri­e­tary LED ar­ray tech­nol­o­gy pro­vides a high ef­fi­cien­cy BLUE ra­di­a­tion with 450nm wave­length. This light is de­signed to be used for un­der­wa­ter flu­o­res­cence pho­tog­ra­phy . A unique fea­ture is the vari­able pow­er with 5 sett­in­gs rang­ing from 14-55 watts.

Soft 80° beam

The light has a very soft and speck­le free beam of 80° in wa­ter (110° im air).


The self con­tained de­sign makes this light very easy to use. There is no need for spe­cial mount­ings for the bat­tery can­is­ter.
The in­clud­ed brack­et al­lows easy mount­ing on stan­dard arm sys­tems like the Ul­tra Light arms.

Small and lightweight

The de­sign is op­ti­mized for very small di­men­sions and light weight. You do not find any other light for flu­o­res­cence on the mar­ket which is as small and pow­er­full than the LU­NA 4 BLUE.
The com­plete set (light, brack­et, dif­fus­er) ads on­ly 0.7kg (0.22kg in wa­ter) to your gear.

Tough De­sign

The LED can not break and has al­most un­limit­ed life­time.
Thanks to its overtem­per­a­ture pro­tec­tion, the light can al­so be used out­side the wa­ter.

Li-Ion Bat­tery

The LU­NA 4 BLUE us­es a recharge­able Li-Ion bat­tery­pack which of­fers much high­er pow­er den­si­ty and less weight com­pared to NiMH bat­teries. The Li-Ion bat­tery­pack al­so of­fers bet­ter per­for­mance in cold wa­ter con­di­tions than NiMH bat­teries do. The bat­tery­pack can be eas­i­ly exchanged within a few se­conds.
The wall adapter ac­cepts 110V to 240V AC. Exchange­able adapter plugs al­low world­wide use.

Charge Dis­play

An eight stage charge lev­el in­di­ca­tor gives you the charge lev­el while charg­ing or div­ing.


Avai­l­able ac­ces­sories for this light: 


Light flux max. pow­er Can­dle­pow­er max. pow­er Burn­time max. Pow­er max. el. pow­er
20 watt ra­di­at­ed pow­er - 50 min­utes 55 watt


Light flux min. pow­er Can­dle­pow­er min. pow­er Burn­time min. Pow­er min. el. pow­er
6 watt ra­di­at­ed pow­er - 200 min­utes 14 watt


Beam an­gle Cor­re­lat­ed Col­or Tem­per­a­ture Charge time Bat­tery ca­pac­i­ty
80° (in wa­ter), 110° (in air) 450nm wave­length 3-4 hours 44 Wh (nom. 14.4V/3.1Ah)


Di­am­e­ter (Head) Length Dry weight Wet weight
7.2 cm 16 cm 0.7 kg 0.22 kg

Additional Info

Additional Info

SKU kel-700
Manufacturer SKU 700
Brand Keldan Lights
Warranty 2-Year Warranty by Keldan


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Contact Us

Questions? Let us know at: 855-518-8898 or email us at

Hours: Monday through Friday, 10:00 am to 6:00 pm, Pacific Time.

We are located at:
    33 Hammond, Suite 206
    Irvine, CA 92618

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